diff --git a/src/com/android/phone/EmergencyCallbackModeService.java b/src/com/android/phone/EmergencyCallbackModeService.java
index a07f7aa..41d83c4 100644
--- a/src/com/android/phone/EmergencyCallbackModeService.java
+++ b/src/com/android/phone/EmergencyCallbackModeService.java
@@ -30,13 +30,12 @@
 import android.os.Handler;
 import android.os.IBinder;
 import android.os.Message;
-import android.os.SystemProperties;
+import android.sysprop.TelephonyProperties;
 import android.util.Log;
 
 import com.android.internal.telephony.Phone;
 import com.android.internal.telephony.PhoneConstants;
 import com.android.internal.telephony.TelephonyIntents;
-import com.android.internal.telephony.TelephonyProperties;
 import com.android.internal.telephony.util.NotificationChannelController;
 
 import java.text.SimpleDateFormat;
@@ -50,7 +49,7 @@
 public class EmergencyCallbackModeService extends Service {
 
     // Default Emergency Callback Mode timeout value
-    private static final int DEFAULT_ECM_EXIT_TIMER_VALUE = 300000;
+    private static final long DEFAULT_ECM_EXIT_TIMER_VALUE = 300000L;
     private static final String LOG_TAG = "EmergencyCallbackModeService";
 
     private NotificationManager mNotificationManager = null;
@@ -139,8 +138,7 @@
      */
     private void startTimerNotification() {
         // Get Emergency Callback Mode timeout value
-        long ecmTimeout = SystemProperties.getLong(
-                    TelephonyProperties.PROPERTY_ECM_EXIT_TIMER, DEFAULT_ECM_EXIT_TIMER_VALUE);
+        long ecmTimeout = TelephonyProperties.ecm_exit_timer().orElse(DEFAULT_ECM_EXIT_TIMER_VALUE);
 
         // Show the notification
         showNotification(ecmTimeout);
diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 7fe72ae..01a2a2c 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -52,7 +52,6 @@
 import android.os.ServiceManager;
 import android.os.ServiceSpecificException;
 import android.os.ShellCallback;
-import android.os.SystemProperties;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.os.WorkSource;
@@ -60,6 +59,7 @@
 import android.provider.DeviceConfig;
 import android.provider.Settings;
 import android.provider.Telephony;
+import android.sysprop.TelephonyProperties;
 import android.telecom.PhoneAccount;
 import android.telecom.PhoneAccountHandle;
 import android.telecom.TelecomManager;
@@ -272,10 +272,6 @@
     private static final int SELECT_P2 = 0;
     private static final int SELECT_P3 = 0x10;
 
-    private static final String DEFAULT_NETWORK_MODE_PROPERTY_NAME = "ro.telephony.default_network";
-    private static final String DEFAULT_DATA_ROAMING_PROPERTY_NAME = "ro.com.android.dataroaming";
-    private static final String DEFAULT_MOBILE_DATA_PROPERTY_NAME = "ro.com.android.mobiledata";
-
     /** The singleton instance. */
     private static PhoneInterfaceManager sInstance;
 
@@ -6993,8 +6989,7 @@
      * Returns false if the mobile data is disabled by default, otherwise return true.
      */
     private boolean getDefaultDataEnabled() {
-        return "true".equalsIgnoreCase(
-                SystemProperties.get(DEFAULT_MOBILE_DATA_PROPERTY_NAME, "true"));
+        return TelephonyProperties.mobile_data().orElse(true);
     }
 
     /**
@@ -7005,8 +7000,7 @@
     private boolean getDefaultDataRoamingEnabled(int subId) {
         final CarrierConfigManager configMgr = (CarrierConfigManager)
                 mApp.getSystemService(Context.CARRIER_CONFIG_SERVICE);
-        boolean isDataRoamingEnabled = "true".equalsIgnoreCase(
-                SystemProperties.get(DEFAULT_DATA_ROAMING_PROPERTY_NAME, "false"));
+        boolean isDataRoamingEnabled = TelephonyProperties.data_roaming().orElse(true);
         isDataRoamingEnabled |= configMgr.getConfigForSubId(subId).getBoolean(
                 CarrierConfigManager.KEY_CARRIER_DEFAULT_DATA_ROAMING_ENABLED_BOOL);
         return isDataRoamingEnabled;
@@ -7017,11 +7011,12 @@
      * not set, return {@link Phone#PREFERRED_NT_MODE}.
      */
     private int getDefaultNetworkType(int subId) {
-        return Integer.parseInt(
-                TelephonyManager.getTelephonyProperty(
-                        mSubscriptionController.getPhoneId(subId),
-                        DEFAULT_NETWORK_MODE_PROPERTY_NAME,
-                        String.valueOf(Phone.PREFERRED_NT_MODE)));
+        List<Integer> list = TelephonyProperties.default_network();
+        int phoneId = mSubscriptionController.getPhoneId(subId);
+        if (phoneId >= 0 && phoneId < list.size() && list.get(phoneId) != null) {
+            return list.get(phoneId);
+        }
+        return Phone.PREFERRED_NT_MODE;
     }
 
     @Override