diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 8d03ed7..eef01fa 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -279,7 +279,7 @@
         <activity android:name="GsmUmtsCallForwardOptions"
                 android:label="@string/labelCF"
                 android:configChanges="orientation|screenSize|keyboardHidden"
-                android:exported="true"
+                android:exported="false"
                 android:theme="@style/CallSettingsWithoutDividerTheme">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -289,7 +289,7 @@
         <activity android:name="CdmaCallForwardOptions"
                 android:label="@string/labelCF"
                 android:configChanges="orientation|screenSize|keyboardHidden"
-                android:exported="true"
+                android:exported="false"
                 android:theme="@style/CallSettingsWithoutDividerTheme">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -299,7 +299,7 @@
         <activity android:name="GsmUmtsCallBarringOptions"
                 android:label="@string/labelCallBarring"
                 android:configChanges="orientation|screenSize|keyboardHidden"
-                android:exported="true"
+                android:exported="false"
                 android:theme="@style/DialerSettingsLight">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -309,7 +309,7 @@
         <activity android:name="GsmUmtsAdditionalCallOptions"
                 android:label="@string/labelGSMMore"
                 android:configChanges="orientation|screenSize|keyboardHidden"
-                android:exported="true"
+                android:exported="false"
                 android:theme="@style/CallSettingsWithoutDividerTheme">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
diff --git a/OWNERS b/OWNERS
index 0fed2f0..7b7fde3 100644
--- a/OWNERS
+++ b/OWNERS
@@ -7,7 +7,6 @@
 xiaotonj@google.com
 huiwang@google.com
 jayachandranc@google.com
-chinmayd@google.com
 amruthr@google.com
 sasindran@google.com
 tjstuart@google.com
diff --git a/ecc/input/OWNERS b/ecc/input/OWNERS
index 3ffab0b..2ed2f3f 100644
--- a/ecc/input/OWNERS
+++ b/ecc/input/OWNERS
@@ -1,5 +1,5 @@
 set noparent
 
 tgunn@google.com
-chinmayd@google.com
+breadley@google.com
 rgreenwalt@google.com
\ No newline at end of file
diff --git a/ecc/output/OWNERS b/ecc/output/OWNERS
index 5685875..2ed2f3f 100644
--- a/ecc/output/OWNERS
+++ b/ecc/output/OWNERS
@@ -1,4 +1,5 @@
 set noparent
 
 tgunn@google.com
-chinmayd@google.com
\ No newline at end of file
+breadley@google.com
+rgreenwalt@google.com
\ No newline at end of file
diff --git a/res/values-zh-rCN/strings.xml b/res/values-zh-rCN/strings.xml
index de28c84..9f3cdd5 100644
--- a/res/values-zh-rCN/strings.xml
+++ b/res/values-zh-rCN/strings.xml
@@ -63,18 +63,18 @@
     <string name="labelCdmaMore_with_label" msgid="7759692829160238152">"CDMA 通话设置（<xliff:g id="SUBSCRIPTIONLABEL">%s</xliff:g>）"</string>
     <string name="apn_settings" msgid="1978652203074756623">"接入点名称 (APN)"</string>
     <string name="settings_label" msgid="9101778088412567956">"网络设置"</string>
-    <string name="phone_accounts" msgid="1216879437523774604">"通话帐号"</string>
-    <string name="phone_accounts_make_calls_with" msgid="16747814788918145">"选择通话帐号"</string>
-    <string name="phone_accounts_make_sip_calls_with" msgid="4691221006731847255">"选择 SIP 通话帐号"</string>
+    <string name="phone_accounts" msgid="1216879437523774604">"通话账号"</string>
+    <string name="phone_accounts_make_calls_with" msgid="16747814788918145">"选择通话账号"</string>
+    <string name="phone_accounts_make_sip_calls_with" msgid="4691221006731847255">"选择 SIP 通话账号"</string>
     <string name="phone_accounts_ask_every_time" msgid="6192347582666047168">"先询问"</string>
     <string name="phone_accounts_default_account_label" msgid="5107598881335931101">"无可用网络"</string>
     <string name="phone_accounts_settings_header" msgid="6296501692964706536">"设置"</string>
-    <string name="phone_accounts_choose_accounts" msgid="4748805293314824974">"选择帐号"</string>
-    <string name="phone_accounts_selection_header" msgid="2945830843104108440">"电话帐号"</string>
-    <string name="phone_accounts_add_sip_account" msgid="1437634802033309305">"添加 SIP 帐号"</string>
-    <string name="phone_accounts_configure_account_settings" msgid="6622119715253196586">"配置帐号设置"</string>
-    <string name="phone_accounts_all_calling_accounts" msgid="1609600743500618823">"所有通话帐号"</string>
-    <string name="phone_accounts_all_calling_accounts_summary" msgid="2214134955430107240">"选择可用于拨打电话的帐号"</string>
+    <string name="phone_accounts_choose_accounts" msgid="4748805293314824974">"选择账号"</string>
+    <string name="phone_accounts_selection_header" msgid="2945830843104108440">"电话账号"</string>
+    <string name="phone_accounts_add_sip_account" msgid="1437634802033309305">"添加 SIP 账号"</string>
+    <string name="phone_accounts_configure_account_settings" msgid="6622119715253196586">"配置账号设置"</string>
+    <string name="phone_accounts_all_calling_accounts" msgid="1609600743500618823">"所有通话账号"</string>
+    <string name="phone_accounts_all_calling_accounts_summary" msgid="2214134955430107240">"选择可用于拨打电话的账号"</string>
     <string name="wifi_calling" msgid="3650509202851355742">"WLAN 通话"</string>
     <string name="connection_service_default_label" msgid="7332739049855715584">"内置网络连接服务"</string>
     <string name="voicemail" msgid="7697769412804195032">"语音信箱"</string>
@@ -134,7 +134,7 @@
     <string name="updating_title" msgid="6130548922615719689">"通话设置"</string>
     <string name="call_settings_admin_user_only" msgid="7238947387649986286">"只有管理员用户才能更改通话设置。"</string>
     <string name="call_settings_no_config_mobile_networks" msgid="5158212415701421219">"设备所有者对更改移动网络设置的功能进行了限制。"</string>
-    <string name="phone_account_settings_user_restriction" msgid="9142685151087208396">"电话帐号设置只能由管理员或工作资料用户更改。"</string>
+    <string name="phone_account_settings_user_restriction" msgid="9142685151087208396">"电话账号设置只能由管理员或工作资料用户更改。"</string>
     <string name="call_settings_with_label" msgid="8460230435361579511">"设置（<xliff:g id="SUBSCRIPTIONLABEL">%s</xliff:g>）"</string>
     <string name="error_updating_title" msgid="2024290892676808965">"通话设置出错"</string>
     <string name="reading_settings" msgid="1605904432450871183">"正在读取设置..."</string>
@@ -296,8 +296,8 @@
     <string name="limited_sim_function_notification_title" msgid="612715399099846281">"SIM 卡功能受限"</string>
     <string name="limited_sim_function_with_phone_num_notification_message" msgid="5928988883403677610">"使用 <xliff:g id="PHONE_NUMBER">%2$s</xliff:g> 时，系统可能会屏蔽<xliff:g id="CARRIER_NAME">%1$s</xliff:g>通话和数据服务。"</string>
     <string name="limited_sim_function_notification_message" msgid="5338638075496721160">"使用另一张 SIM 卡时，系统可能会屏蔽<xliff:g id="CARRIER_NAME">%1$s</xliff:g>通话和数据服务。"</string>
-    <string name="sip_accounts_removed_notification_title" msgid="3528076957535736095">"系统已找到并移除已弃用的 SIP 帐号"</string>
-    <string name="sip_accounts_removed_notification_message" msgid="1916856744869791592">"SIP 通话已不再受 Android 平台支持。\n您现有的 SIP 帐号 <xliff:g id="REMOVED_SIP_ACCOUNTS">%s</xliff:g> 已被移除。\n请确认您的默认通话帐号设置。"</string>
+    <string name="sip_accounts_removed_notification_title" msgid="3528076957535736095">"系统已找到并移除已弃用的 SIP 账号"</string>
+    <string name="sip_accounts_removed_notification_message" msgid="1916856744869791592">"SIP 通话已不再受 Android 平台支持。\n您现有的 SIP 账号 <xliff:g id="REMOVED_SIP_ACCOUNTS">%s</xliff:g> 已被移除。\n请确认您的默认通话账号设置。"</string>
     <string name="sip_accounts_removed_notification_action" msgid="3772778402370555562">"转到设置"</string>
     <string name="data_usage_title" msgid="8438592133893837464">"应用的流量使用情况"</string>
     <string name="data_usage_template" msgid="6287906680674061783">"<xliff:g id="ID_2">%2$s</xliff:g>期间使用的移动数据流量为：<xliff:g id="ID_1">%1$s</xliff:g>"</string>
@@ -926,7 +926,7 @@
     <string name="trigger_carrier_provisioning" msgid="1301829588620638234">"触发运营商配置"</string>
     <string name="call_quality_notification_bluetooth_details" msgid="8348950331707346711">"您的蓝牙信号较弱。请尝试切换为扬声器模式。"</string>
     <string name="call_quality_notification_name" msgid="3476828289553948830">"通话质量通知"</string>
-    <string name="notification_channel_sip_account" msgid="1261816025156179637">"已弃用的 SIP 帐号"</string>
+    <string name="notification_channel_sip_account" msgid="1261816025156179637">"已弃用的 SIP 账号"</string>
     <string name="send_from_work_profile_title" msgid="7044759579507604732">"无法通过个人应用发送消息"</string>
     <string name="send_from_work_profile_description" msgid="2174402508727161974">"贵组织仅允许您通过工作应用发送消息"</string>
     <string name="send_from_work_profile_cancel" msgid="177746511030381711">"取消"</string>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index f92ece1..61143c9 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -289,8 +289,6 @@
     <string name="updating_title">Call settings</string>
     <!-- Toast in Call settings when asked to launch settings for a secondary user -->
     <string name="call_settings_admin_user_only">Call settings can only be changed by the admin user.</string>
-    <!-- Toast in Call settings when asked to launch settings when DISALLOW_CONFIG_MOBILE_NETWORKS is true -->
-    <string name="call_settings_no_config_mobile_networks">The device owner has restricted the ability to change mobile network settings.</string>
     <!-- Toast in Phone Account settings when asked to launch settings for a secondary/guest user -->
     <string name="phone_account_settings_user_restriction">Phone account settings can only be changed by the admin or work user.</string>
     <!-- Title of the "Call settings" settings screen, with a text label identifying which SIM the settings are for. -->
diff --git a/src/com/android/phone/CallFeaturesSetting.java b/src/com/android/phone/CallFeaturesSetting.java
index 8129deb..145df41 100644
--- a/src/com/android/phone/CallFeaturesSetting.java
+++ b/src/com/android/phone/CallFeaturesSetting.java
@@ -263,14 +263,6 @@
             return;
         }
 
-        // Make sure mobile network configurations are not restricted.
-        if (userManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS)) {
-            Toast.makeText(this, R.string.call_settings_no_config_mobile_networks,
-                    Toast.LENGTH_SHORT).show();
-            finish();
-            return;
-        }
-
         mSubscriptionInfoHelper = new SubscriptionInfoHelper(this, getIntent());
         mPhone = mSubscriptionInfoHelper.getPhone();
         mSubscriptionInfoHelper.setActionBarTitle(
diff --git a/src/com/android/phone/CarrierConfigLoader.java b/src/com/android/phone/CarrierConfigLoader.java
index bbd1f4d..3eafb24 100644
--- a/src/com/android/phone/CarrierConfigLoader.java
+++ b/src/com/android/phone/CarrierConfigLoader.java
@@ -68,8 +68,8 @@
 import com.android.internal.telephony.TelephonyPermissions;
 import com.android.internal.telephony.subscription.SubscriptionManagerService;
 import com.android.internal.telephony.util.ArrayUtils;
+import com.android.internal.telephony.util.TelephonyUtils;
 import com.android.internal.util.IndentingPrintWriter;
-import com.android.telephony.Rlog;
 
 import java.io.File;
 import java.io.FileDescriptor;
@@ -79,12 +79,19 @@
 import java.io.FilenameFilter;
 import java.io.IOException;
 import java.io.PrintWriter;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.Locale;
 import java.util.Objects;
 import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 /**
  * CarrierConfigLoader binds to privileged carrier apps to fetch carrier config overlays.
@@ -92,6 +99,9 @@
 public class CarrierConfigLoader extends ICarrierConfigLoader.Stub {
     private static final String LOG_TAG = "CarrierConfigLoader";
 
+    private static final SimpleDateFormat TIME_FORMAT =
+            new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US);
+
     // Package name for platform carrier config app, bundled with system image.
     @NonNull private final String mPlatformCarrierConfigPackage;
 
@@ -130,7 +140,7 @@
     // Broadcast receiver for system events
     @NonNull
     private final BroadcastReceiver mSystemBroadcastReceiver = new ConfigLoaderBroadcastReceiver();
-    @NonNull private final LocalLog mCarrierConfigLoadingLog = new LocalLog(100);
+    @NonNull private final LocalLog mCarrierConfigLoadingLog = new LocalLog(256);
     // Number of phone instances (active modem count)
     private int mNumPhones;
 
@@ -229,7 +239,7 @@
         @Override
         public void handleMessage(@NonNull Message msg) {
             final int phoneId = msg.arg1;
-            logdWithLocalLog("mHandler: " + eventToString(msg.what) + " phoneId: " + phoneId);
+            logd(eventToString(msg.what) + " phoneId: " + phoneId);
             if (!SubscriptionManager.isValidPhoneId(phoneId)
                     && msg.what != EVENT_MULTI_SIM_CONFIG_CHANGED) {
                 return;
@@ -277,19 +287,11 @@
                     PersistableBundle config = restoreConfigFromXml(
                             mPlatformCarrierConfigPackage, OVERRIDE_PACKAGE_ADDITION, phoneId);
                     if (config != null) {
-                        logd("Loaded persistent override config from XML. package="
-                                + mPlatformCarrierConfigPackage
-                                + " phoneId=" + phoneId);
                         mPersistentOverrideConfigs[phoneId] = config;
                     }
 
                     config = restoreConfigFromXml(mPlatformCarrierConfigPackage, "", phoneId);
                     if (config != null) {
-                        logd(
-                                "Loaded config from XML. package="
-                                        + mPlatformCarrierConfigPackage
-                                        + " phoneId="
-                                        + phoneId);
                         mConfigFromDefaultApp[phoneId] = config;
                         Message newMsg = obtainMessage(EVENT_FETCH_DEFAULT_DONE, phoneId, -1);
                         newMsg.getData().putBoolean("loaded_from_xml", true);
@@ -364,10 +366,10 @@
                         carrierService.getCarrierConfig(phoneId, carrierId, resultReceiver);
                         logdWithLocalLog("Fetch config for default app: "
                                 + mPlatformCarrierConfigPackage
-                                + " carrierid: " + carrierId.toString());
+                                + ", carrierId=" + carrierId.getSpecificCarrierId());
                     } catch (RemoteException e) {
                         loge("Failed to get carrier config from default app: " +
-                                mPlatformCarrierConfigPackage + " err: " + e.toString());
+                                mPlatformCarrierConfigPackage + " err: " + e);
                         unbindIfBound(mContext, conn, phoneId);
                         break; // So we don't set a timeout.
                     }
@@ -419,11 +421,6 @@
                     final PersistableBundle config =
                             restoreConfigFromXml(carrierPackageName, "", phoneId);
                     if (config != null) {
-                        logd(
-                                "Loaded config from XML. package="
-                                        + carrierPackageName
-                                        + " phoneId="
-                                        + phoneId);
                         mConfigFromCarrierApp[phoneId] = config;
                         Message newMsg = obtainMessage(EVENT_FETCH_CARRIER_DONE, phoneId, -1);
                         newMsg.getData().putBoolean("loaded_from_xml", true);
@@ -504,9 +501,9 @@
                         carrierService.getCarrierConfig(phoneId, carrierId, resultReceiver);
                         logdWithLocalLog("Fetch config for carrier app: "
                                 + getCarrierPackageForPhoneId(phoneId)
-                                + " carrierid: " + carrierId.toString());
+                                + ", carrierId=" + carrierId.getSpecificCarrierId());
                     } catch (RemoteException e) {
-                        loge("Failed to get carrier config: " + e.toString());
+                        loge("Failed to get carrier config: " + e);
                         unbindIfBound(mContext, conn, phoneId);
                         break; // So we don't set a timeout.
                     }
@@ -578,8 +575,6 @@
                             restoreNoSimConfigFromXml(mPlatformCarrierConfigPackage);
 
                     if (config != null) {
-                        logd("Loaded no SIM config from XML. package="
-                                + mPlatformCarrierConfigPackage);
                         mNoSimConfig = config;
                         sendMessage(
                                 obtainMessage(
@@ -674,7 +669,7 @@
                                 + mPlatformCarrierConfigPackage);
                     } catch (RemoteException e) {
                         loge("Failed to get no sim carrier config from default app: " +
-                                mPlatformCarrierConfigPackage + " err: " + e.toString());
+                                mPlatformCarrierConfigPackage + " err: " + e);
                         unbindIfBoundForNoSimConfig(mContext, conn, phoneId);
                         break; // So we don't set a timeout.
                     }
@@ -1005,7 +1000,7 @@
             int phoneId, @Nullable CarrierIdentifier carrierId, @NonNull PersistableBundle config,
             boolean isNoSimConfig) {
         if (packageName == null) {
-            loge("Cannot save config with null packageName");
+            loge("Cannot save config with null packageName. phoneId=" + phoneId);
             return;
         }
 
@@ -1015,7 +1010,7 @@
         } else {
             if (TelephonyManager.getSimStateForSlotIndex(phoneId)
                     != TelephonyManager.SIM_STATE_LOADED) {
-                loge("Skip save config because SIM records are not loaded.");
+                loge("Skip saving config because SIM records are not loaded. phoneId=" + phoneId);
                 return;
             }
 
@@ -1023,7 +1018,7 @@
             final int cid = carrierId != null ? carrierId.getSpecificCarrierId()
                     : TelephonyManager.UNKNOWN_CARRIER_ID;
             if (iccid == null) {
-                loge("Cannot save config with null iccid.");
+                loge("Cannot save config with null iccid. phoneId=" + phoneId);
                 return;
             }
             fileName = getFilenameForConfig(packageName, extraString, iccid, cid);
@@ -1040,12 +1035,12 @@
 
         final String version = getPackageVersion(packageName);
         if (version == null) {
-            loge("Failed to get package version for: " + packageName);
+            loge("Failed to get package version for: " + packageName + ", phoneId=" + phoneId);
             return;
         }
 
-        logdWithLocalLog(
-                "Save config to xml, packagename: " + packageName + " phoneId: " + phoneId);
+        logdWithLocalLog("Save carrier config to cache. phoneId=" + phoneId
+                        + ", xml=" + getFilePathForLogging(fileName) + ", version=" + version);
 
         FileOutputStream outFile = null;
         try {
@@ -1106,14 +1101,14 @@
         } else {
             if (TelephonyManager.getSimStateForSlotIndex(phoneId)
                     != TelephonyManager.SIM_STATE_LOADED) {
-                loge("Skip restore config because SIM records are not loaded.");
+                loge("Skip restore config because SIM records are not loaded. phoneId=" + phoneId);
                 return null;
             }
 
             iccid = getIccIdForPhoneId(phoneId);
             final int cid = getSpecificCarrierIdForPhoneId(phoneId);
             if (iccid == null) {
-                loge("Cannot restore config with null iccid.");
+                loge("Cannot restore config with null iccid. phoneId=" + phoneId);
                 return null;
             }
             fileName = getFilenameForConfig(packageName, extraString, iccid, cid);
@@ -1121,30 +1116,37 @@
 
         PersistableBundle restoredBundle = null;
         File file = new File(mContext.getFilesDir(), fileName);
+        String filePath = file.getPath();
+        String savedVersion = null;
         try (FileInputStream inFile = new FileInputStream(file)) {
 
             restoredBundle = PersistableBundle.readFromStream(inFile);
-            String savedVersion = restoredBundle.getString(KEY_VERSION);
+            savedVersion = restoredBundle.getString(KEY_VERSION);
             restoredBundle.remove(KEY_VERSION);
 
             if (!version.equals(savedVersion)) {
-                loge("Saved version mismatch: " + version + " vs " + savedVersion);
+                loge("Saved version mismatch: " + version + " vs " + savedVersion
+                        + ", phoneId=" + phoneId);
                 restoredBundle = null;
             }
         } catch (FileNotFoundException e) {
             // Missing file is normal occurrence that might occur with a new sim or when restoring
             // an override file during boot and should not be treated as an error.
             if (isNoSimConfig) {
-                logd("File not found: " + file.getPath());
+                logd("File not found: " + file.getPath() + ", phoneId=" + phoneId);
             } else {
-                String filePath = file.getPath();
-                filePath = getFilePathForLogging(filePath, iccid);
-                logd("File not found : " + filePath);
+                logd("File not found : " + getFilePathForLogging(filePath, iccid)
+                        + ", phoneId=" + phoneId);
             }
         } catch (IOException e) {
             loge(e.toString());
         }
 
+        if (restoredBundle != null) {
+            logdWithLocalLog("Restored carrier config from cache. phoneId=" + phoneId + ", xml="
+                    + getFilePathForLogging(fileName) + ", version=" + savedVersion
+                    + ", modified time=" + getFileTime(filePath));
+        }
         return restoredBundle;
     }
 
@@ -1154,7 +1156,7 @@
     @NonNull
     private String getFilePathForLogging(@Nullable String filePath, @Nullable String iccid) {
         // If loggable then return with actual file path
-        if (Rlog.isLoggable(LOG_TAG, Log.VERBOSE)) {
+        if (TelephonyUtils.IS_DEBUGGABLE) {
             return filePath;
         }
         String path = filePath;
@@ -1198,7 +1200,7 @@
         });
         if (packageFiles == null || packageFiles.length < 1) return false;
         for (File f : packageFiles) {
-            logd("Deleting " + getFilePathForLogging(f.getName()));
+            logdWithLocalLog("Deleting " + getFilePathForLogging(f.getName()));
             f.delete();
         }
         return true;
@@ -1435,6 +1437,8 @@
                     fileToDelete.delete();
                 }
             }
+            logdWithLocalLog("overrideConfig: subId=" + subscriptionId + ", persistent="
+                    + persistent + ", overrides=" + overrides);
             updateSubscriptionDatabase(phoneId);
         });
     }
@@ -1464,6 +1468,9 @@
                     "Invalid phoneId " + phoneId + " for subId " + subscriptionId);
         }
 
+        logdWithLocalLog("Notified carrier config changed. phoneId=" + phoneId
+                + ", subId=" + subscriptionId);
+
         // This method should block until deleting has completed, so that an error which prevents us
         // from clearing the cache is passed back to the carrier app. With the files successfully
         // deleted, this can return and we will eventually bind to the carrier app.
@@ -1477,7 +1484,7 @@
     @Override
     public void updateConfigForPhoneId(int phoneId, @NonNull String simState) {
         updateConfigForPhoneId_enforcePermission();
-        logdWithLocalLog("Update config for phoneId: " + phoneId + " simState: " + simState);
+        logdWithLocalLog("Update config for phoneId=" + phoneId + " simState=" + simState);
         if (!SubscriptionManager.isValidPhoneId(phoneId)) {
             throw new IllegalArgumentException("Invalid phoneId: " + phoneId);
         }
@@ -1567,6 +1574,27 @@
     }
 
     /**
+     * Get the file time in readable format.
+     *
+     * @param filePath The full file path.
+     *
+     * @return The time in string format.
+     */
+    @Nullable
+    private String getFileTime(@NonNull String filePath) {
+        String formattedModifiedTime = null;
+        try {
+            // Convert the modified time to a readable format
+            formattedModifiedTime = TIME_FORMAT.format(Files.readAttributes(Paths.get(filePath),
+                    BasicFileAttributes.class).lastModifiedTime().toMillis());
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return formattedModifiedTime;
+    }
+
+    /**
      * If {@code args} contains {@link #DUMP_ARG_REQUESTING_PACKAGE} and a following package name,
      * we'll also call {@link IBinder#dump} on the default carrier service (if bound) and the
      * specified carrier service (if bound). Typically, this is done for connectivity bug reports
@@ -1607,8 +1635,20 @@
         }
 
         printConfig(mNoSimConfig, indentPW, "mNoSimConfig");
-        indentPW.println("CarrierConfigLoadingLog=");
+        indentPW.println("mNumPhones=" + mNumPhones);
+        indentPW.println("mPlatformCarrierConfigPackage=" + mPlatformCarrierConfigPackage);
+        indentPW.println("mServiceConnection=[" + Stream.of(mServiceConnection)
+                .map(c -> c != null ? c.pkgName : null)
+                .collect(Collectors.joining(", ")) + "]");
+        indentPW.println("mServiceBoundForNoSimConfig="
+                + Arrays.toString(mServiceBoundForNoSimConfig));
+        indentPW.println("mHasSentConfigChange=" + Arrays.toString(mHasSentConfigChange));
+        indentPW.println("mFromSystemUnlocked=" + Arrays.toString(mFromSystemUnlocked));
+        indentPW.println();
+        indentPW.println("CarrierConfigLoader local log=");
+        indentPW.increaseIndent();
         mCarrierConfigLoadingLog.dump(fd, indentPW, args);
+        indentPW.decreaseIndent();
 
         if (requestingPackage != null) {
             logd("Including default and requesting package " + requestingPackage
@@ -1620,6 +1660,16 @@
             dumpCarrierServiceIfBound(fd, indentPW, "Requesting package", requestingPackage,
                     true /* considerCarrierPrivileges */);
         }
+
+        indentPW.println();
+        indentPW.println("Cached config files:");
+        indentPW.increaseIndent();
+        for (File f : mContext.getFilesDir().listFiles((FilenameFilter) (d, filename)
+                -> filename.startsWith("carrierconfig-"))) {
+            indentPW.println(getFilePathForLogging(f.getName()) + ", modified time="
+                    + getFileTime(f.getAbsolutePath()));
+        }
+        indentPW.decreaseIndent();
     }
 
     private void printConfig(@NonNull PersistableBundle configApp,
diff --git a/src/com/android/phone/CdmaCallOptions.java b/src/com/android/phone/CdmaCallOptions.java
index 6145870..e468c00 100644
--- a/src/com/android/phone/CdmaCallOptions.java
+++ b/src/com/android/phone/CdmaCallOptions.java
@@ -16,8 +16,10 @@
 
 package com.android.phone;
 
+import android.content.Context;
 import android.os.Bundle;
 import android.os.PersistableBundle;
+import android.os.UserManager;
 import android.preference.Preference;
 import android.preference.PreferenceScreen;
 import android.telephony.CarrierConfigManager;
@@ -78,9 +80,20 @@
             buttonVoicePrivacy.setEnabled(false);
         }
 
+        // If mobile network configs are restricted, then hide the mCallForwardingPref and
+        // mCallWaitingPref.
+        UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
+        boolean mobileNetworkConfigsRestricted =
+                userManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS);
+        if (mobileNetworkConfigsRestricted) {
+            Log.i(LOG_TAG, "Mobile network configs are restricted, hiding CDMA call forwarding "
+                    + "and CDMA call waiting options.");
+        }
+
         mCallForwardingPref = getPreferenceScreen().findPreference(CALL_FORWARDING_KEY);
         if (carrierConfig != null && carrierConfig.getBoolean(
-                CarrierConfigManager.KEY_CALL_FORWARDING_VISIBILITY_BOOL)) {
+                CarrierConfigManager.KEY_CALL_FORWARDING_VISIBILITY_BOOL) &&
+                !mobileNetworkConfigsRestricted) {
             mCallForwardingPref.setIntent(
                     subInfoHelper.getIntent(CdmaCallForwardOptions.class));
         } else {
@@ -91,7 +104,8 @@
         mCallWaitingPref = (CdmaCallWaitingPreference) getPreferenceScreen()
                 .findPreference(CALL_WAITING_KEY);
         if (carrierConfig == null || !carrierConfig.getBoolean(
-                CarrierConfigManager.KEY_ADDITIONAL_SETTINGS_CALL_WAITING_VISIBILITY_BOOL)) {
+                CarrierConfigManager.KEY_ADDITIONAL_SETTINGS_CALL_WAITING_VISIBILITY_BOOL) ||
+                mobileNetworkConfigsRestricted) {
             getPreferenceScreen().removePreference(mCallWaitingPref);
             mCallWaitingPref = null;
         }
diff --git a/src/com/android/phone/GsmUmtsCallOptions.java b/src/com/android/phone/GsmUmtsCallOptions.java
index 51d1b66..8ff7ecc 100644
--- a/src/com/android/phone/GsmUmtsCallOptions.java
+++ b/src/com/android/phone/GsmUmtsCallOptions.java
@@ -16,13 +16,16 @@
 
 package com.android.phone;
 
+import android.content.Context;
 import android.os.Bundle;
 import android.os.PersistableBundle;
+import android.os.UserManager;
 import android.preference.Preference;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceScreen;
 import android.provider.Settings;
 import android.telephony.CarrierConfigManager;
+import android.util.Log;
 import android.view.MenuItem;
 
 import com.android.internal.telephony.PhoneConstants;
@@ -79,10 +82,22 @@
             isAirplaneModeOff = PhoneGlobals.AIRPLANE_ON != airplaneMode;
         }
 
+        // If mobile network configs are restricted, then hide the GsmUmtsCallForwardOptions,
+        // GsmUmtsAdditionalCallOptions, and GsmUmtsCallBarringOptions.
+        UserManager userManager = (UserManager) subInfoHelper.getPhone().getContext()
+                .getSystemService(Context.USER_SERVICE);
+        boolean mobileNetworkConfigsRestricted =
+                userManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS);
+        if (mobileNetworkConfigsRestricted) {
+            Log.i(LOG_TAG, "Mobile network configs are restricted, hiding GSM call "
+                    + "forwarding, additional call settings, and call options.");
+        }
+
         Preference callForwardingPref = prefScreen.findPreference(CALL_FORWARDING_KEY);
         if (callForwardingPref != null) {
             if (b != null && b.getBoolean(
-                    CarrierConfigManager.KEY_CALL_FORWARDING_VISIBILITY_BOOL)) {
+                    CarrierConfigManager.KEY_CALL_FORWARDING_VISIBILITY_BOOL) &&
+                    !mobileNetworkConfigsRestricted) {
                 callForwardingPref.setIntent(
                         subInfoHelper.getIntent(GsmUmtsCallForwardOptions.class));
                 callForwardingPref.setEnabled(isAirplaneModeOff);
@@ -97,7 +112,8 @@
             if (b != null && (b.getBoolean(
                     CarrierConfigManager.KEY_ADDITIONAL_SETTINGS_CALL_WAITING_VISIBILITY_BOOL)
                     || b.getBoolean(
-                    CarrierConfigManager.KEY_ADDITIONAL_SETTINGS_CALLER_ID_VISIBILITY_BOOL))) {
+                    CarrierConfigManager.KEY_ADDITIONAL_SETTINGS_CALLER_ID_VISIBILITY_BOOL)) &&
+                    !mobileNetworkConfigsRestricted) {
                 additionalGsmSettingsPref.setIntent(
                         subInfoHelper.getIntent(GsmUmtsAdditionalCallOptions.class));
                 additionalGsmSettingsPref.setEnabled(isAirplaneModeOff);
@@ -108,7 +124,8 @@
 
         Preference callBarringPref = prefScreen.findPreference(CALL_BARRING_KEY);
         if (callBarringPref != null) {
-            if (b != null && b.getBoolean(CarrierConfigManager.KEY_CALL_BARRING_VISIBILITY_BOOL)) {
+            if (b != null && b.getBoolean(CarrierConfigManager.KEY_CALL_BARRING_VISIBILITY_BOOL) &&
+                    !mobileNetworkConfigsRestricted) {
                 callBarringPref.setIntent(subInfoHelper.getIntent(GsmUmtsCallBarringOptions.class));
                 callBarringPref.setEnabled(isAirplaneModeOff);
             } else {
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index c7ba5ad..fdb0ead 100644
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -2730,6 +2730,9 @@
          * If PUK is null, unlock SIM card with PIN
          *
          * If PUK is not null, unlock SIM card with PUK and set PIN code
+         *
+         * Besides, since it is reused in class level, the thread's looper will be stopped to avoid
+         * its thread leak.
          */
         synchronized int[] unlockSim(String puk, String pin) {
 
@@ -2765,6 +2768,8 @@
             if (mResult == PhoneConstants.PIN_RESULT_SUCCESS && pin.length() > 0) {
                 UiccController.getInstance().getPinStorage().storePin(pin, mPhoneId);
             }
+            // This instance is no longer reused, so quit its thread's looper.
+            mHandler.getLooper().quitSafely();
 
             return resultArray;
         }
diff --git a/src/com/android/phone/settings/fdn/FdnSetting.java b/src/com/android/phone/settings/fdn/FdnSetting.java
index f561829..e347dec 100644
--- a/src/com/android/phone/settings/fdn/FdnSetting.java
+++ b/src/com/android/phone/settings/fdn/FdnSetting.java
@@ -508,15 +508,6 @@
     protected void onCreate(Bundle icicle) {
         super.onCreate(icicle);
 
-        // Make sure mobile network configurations are not restricted.
-        UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
-        if (userManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_MOBILE_NETWORKS)) {
-            Toast.makeText(this, R.string.call_settings_no_config_mobile_networks,
-                    Toast.LENGTH_SHORT).show();
-            finish();
-            return;
-        }
-
         mSubscriptionInfoHelper = new SubscriptionInfoHelper(this, getIntent());
         mPhone = mSubscriptionInfoHelper.getPhone();