diff --git a/packages/SystemUI/src/com/android/keyguard/CarrierTextManager.java b/packages/SystemUI/src/com/android/keyguard/CarrierTextManager.java
index b153785..1f75e81 100644
--- a/packages/SystemUI/src/com/android/keyguard/CarrierTextManager.java
+++ b/packages/SystemUI/src/com/android/keyguard/CarrierTextManager.java
@@ -16,6 +16,11 @@
 
 package com.android.keyguard;
 
+import static com.android.keyguard.logging.CarrierTextManagerLogger.REASON_ACTIVE_DATA_SUB_CHANGED;
+import static com.android.keyguard.logging.CarrierTextManagerLogger.REASON_ON_SIM_STATE_CHANGED;
+import static com.android.keyguard.logging.CarrierTextManagerLogger.REASON_ON_TELEPHONY_CAPABLE;
+import static com.android.keyguard.logging.CarrierTextManagerLogger.REASON_REFRESH_CARRIER_INFO;
+
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
@@ -32,6 +37,7 @@
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 
+import com.android.keyguard.logging.CarrierTextManagerLogger;
 import com.android.settingslib.WirelessUtils;
 import com.android.systemui.R;
 import com.android.systemui.dagger.qualifiers.Background;
@@ -40,6 +46,7 @@
 import com.android.systemui.statusbar.pipeline.wifi.data.repository.WifiRepository;
 import com.android.systemui.telephony.TelephonyListenerManager;
 
+import java.util.Arrays;
 import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.Executor;
@@ -68,6 +75,7 @@
     private final AtomicBoolean mNetworkSupported = new AtomicBoolean();
     @VisibleForTesting
     protected KeyguardUpdateMonitor mKeyguardUpdateMonitor;
+    private final CarrierTextManagerLogger mLogger;
     private final WifiRepository mWifiRepository;
     private final boolean[] mSimErrorState;
     private final int mSimSlotsNumber;
@@ -97,19 +105,13 @@
     protected final KeyguardUpdateMonitorCallback mCallback = new KeyguardUpdateMonitorCallback() {
         @Override
         public void onRefreshCarrierInfo() {
-            if (DEBUG) {
-                Log.d(TAG, "onRefreshCarrierInfo(), mTelephonyCapable: "
-                        + Boolean.toString(mTelephonyCapable));
-            }
+            mLogger.logUpdateCarrierTextForReason(REASON_REFRESH_CARRIER_INFO);
             updateCarrierText();
         }
 
         @Override
         public void onTelephonyCapable(boolean capable) {
-            if (DEBUG) {
-                Log.d(TAG, "onTelephonyCapable() mTelephonyCapable: "
-                        + Boolean.toString(capable));
-            }
+            mLogger.logUpdateCarrierTextForReason(REASON_ON_TELEPHONY_CAPABLE);
             mTelephonyCapable = capable;
             updateCarrierText();
         }
@@ -121,7 +123,7 @@
                 return;
             }
 
-            if (DEBUG) Log.d(TAG, "onSimStateChanged: " + getStatusForIccState(simState));
+            mLogger.logUpdateCarrierTextForReason(REASON_ON_SIM_STATE_CHANGED);
             if (getStatusForIccState(simState) == CarrierTextManager.StatusMode.SimIoError) {
                 mSimErrorState[slotId] = true;
                 updateCarrierText();
@@ -137,6 +139,7 @@
         @Override
         public void onActiveDataSubscriptionIdChanged(int subId) {
             if (mNetworkSupported.get() && mCarrierTextCallback != null) {
+                mLogger.logUpdateCarrierTextForReason(REASON_ACTIVE_DATA_SUB_CHANGED);
                 updateCarrierText();
             }
         }
@@ -175,7 +178,9 @@
             WakefulnessLifecycle wakefulnessLifecycle,
             @Main Executor mainExecutor,
             @Background Executor bgExecutor,
-            KeyguardUpdateMonitor keyguardUpdateMonitor) {
+            KeyguardUpdateMonitor keyguardUpdateMonitor,
+            CarrierTextManagerLogger logger) {
+
         mContext = context;
         mIsEmergencyCallCapable = telephonyManager.isVoiceCapable();
 
@@ -191,6 +196,7 @@
         mMainExecutor = mainExecutor;
         mBgExecutor = bgExecutor;
         mKeyguardUpdateMonitor = keyguardUpdateMonitor;
+        mLogger = logger;
         mBgExecutor.execute(() -> {
             boolean supported = mContext.getPackageManager()
                     .hasSystemFeature(PackageManager.FEATURE_TELEPHONY);
@@ -315,7 +321,7 @@
             subOrderBySlot[i] = -1;
         }
         final CharSequence[] carrierNames = new CharSequence[numSubs];
-        if (DEBUG) Log.d(TAG, "updateCarrierText(): " + numSubs);
+        mLogger.logUpdate(numSubs);
 
         for (int i = 0; i < numSubs; i++) {
             int subId = subs.get(i).getSubscriptionId();
@@ -325,9 +331,7 @@
             int simState = mKeyguardUpdateMonitor.getSimState(subId);
             CharSequence carrierName = subs.get(i).getCarrierName();
             CharSequence carrierTextForSimState = getCarrierTextForSimState(simState, carrierName);
-            if (DEBUG) {
-                Log.d(TAG, "Handling (subId=" + subId + "): " + simState + " " + carrierName);
-            }
+            mLogger.logUpdateLoopStart(subId, simState, String.valueOf(carrierName));
             if (carrierTextForSimState != null) {
                 allSimsMissing = false;
                 carrierNames[i] = carrierTextForSimState;
@@ -340,9 +344,7 @@
                     // Wi-Fi is disassociated or disabled
                     if (ss.getRilDataRadioTechnology() != ServiceState.RIL_RADIO_TECHNOLOGY_IWLAN
                             || mWifiRepository.isWifiConnectedWithValidSsid()) {
-                        if (DEBUG) {
-                            Log.d(TAG, "SIM ready and in service: subId=" + subId + ", ss=" + ss);
-                        }
+                        mLogger.logUpdateWfcCheck();
                         anySimReadyAndInService = true;
                     }
                 }
@@ -379,7 +381,7 @@
                     if (i.getBooleanExtra(TelephonyManager.EXTRA_SHOW_PLMN, false)) {
                         plmn = i.getStringExtra(TelephonyManager.EXTRA_PLMN);
                     }
-                    if (DEBUG) Log.d(TAG, "Getting plmn/spn sticky brdcst " + plmn + "/" + spn);
+                    mLogger.logUpdateFromStickyBroadcast(plmn, spn);
                     if (Objects.equals(plmn, spn)) {
                         text = plmn;
                     } else {
@@ -409,6 +411,7 @@
                 !allSimsMissing,
                 subsIds,
                 airplaneMode);
+        mLogger.logCallbackSentFromUpdate(info);
         postToCallback(info);
         Trace.endSection();
     }
@@ -645,6 +648,7 @@
         private final Executor mMainExecutor;
         private final Executor mBgExecutor;
         private final KeyguardUpdateMonitor mKeyguardUpdateMonitor;
+        private final CarrierTextManagerLogger mLogger;
         private boolean mShowAirplaneMode;
         private boolean mShowMissingSim;
 
@@ -658,7 +662,8 @@
                 WakefulnessLifecycle wakefulnessLifecycle,
                 @Main Executor mainExecutor,
                 @Background Executor bgExecutor,
-                KeyguardUpdateMonitor keyguardUpdateMonitor) {
+                KeyguardUpdateMonitor keyguardUpdateMonitor,
+                CarrierTextManagerLogger logger) {
             mContext = context;
             mSeparator = resources.getString(
                     com.android.internal.R.string.kg_text_message_separator);
@@ -669,6 +674,7 @@
             mMainExecutor = mainExecutor;
             mBgExecutor = bgExecutor;
             mKeyguardUpdateMonitor = keyguardUpdateMonitor;
+            mLogger = logger;
         }
 
         /** */
@@ -688,7 +694,7 @@
             return new CarrierTextManager(
                     mContext, mSeparator, mShowAirplaneMode, mShowMissingSim, mWifiRepository,
                     mTelephonyManager, mTelephonyListenerManager, mWakefulnessLifecycle,
-                    mMainExecutor, mBgExecutor, mKeyguardUpdateMonitor);
+                    mMainExecutor, mBgExecutor, mKeyguardUpdateMonitor, mLogger);
         }
     }
     /**
@@ -716,6 +722,17 @@
             this.subscriptionIds = subscriptionIds;
             this.airplaneMode = airplaneMode;
         }
+
+        @Override
+        public String toString() {
+            return "CarrierTextCallbackInfo{"
+                    + "carrierText=" + carrierText
+                    + ", listOfCarriers=" + Arrays.toString(listOfCarriers)
+                    + ", anySimReady=" + anySimReady
+                    + ", subscriptionIds=" + Arrays.toString(subscriptionIds)
+                    + ", airplaneMode=" + airplaneMode
+                    + '}';
+        }
     }
 
     /**
diff --git a/packages/SystemUI/src/com/android/keyguard/logging/CarrierTextManagerLogger.kt b/packages/SystemUI/src/com/android/keyguard/logging/CarrierTextManagerLogger.kt
new file mode 100644
index 0000000..3dc787c
--- /dev/null
+++ b/packages/SystemUI/src/com/android/keyguard/logging/CarrierTextManagerLogger.kt
@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.keyguard.logging
+
+import androidx.annotation.IntDef
+import com.android.keyguard.CarrierTextManager.CarrierTextCallbackInfo
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.log.LogBuffer
+import com.android.systemui.log.LogLevel
+import com.android.systemui.log.dagger.CarrierTextManagerLog
+import javax.inject.Inject
+
+/** Logger adapter for [CarrierTextManager] to add detailed messages in a [LogBuffer] */
+@SysUISingleton
+class CarrierTextManagerLogger @Inject constructor(@CarrierTextManagerLog val buffer: LogBuffer) {
+    /**
+     * This method and the methods below trace the execution of CarrierTextManager.updateCarrierText
+     */
+    fun logUpdate(numSubs: Int) {
+        buffer.log(
+            TAG,
+            LogLevel.VERBOSE,
+            { int1 = numSubs },
+            { "updateCarrierText: numSubs=$int1" },
+        )
+    }
+
+    fun logUpdateLoopStart(sub: Int, simState: Int, carrierName: String) {
+        buffer.log(
+            TAG,
+            LogLevel.VERBOSE,
+            {
+                int1 = sub
+                int2 = simState
+                str1 = carrierName
+            },
+            { "┣ updateCarrierText: updating sub=$int1 simState=$int2 carrierName=$str1" },
+        )
+    }
+
+    fun logUpdateWfcCheck() {
+        buffer.log(
+            TAG,
+            LogLevel.VERBOSE,
+            {},
+            { "┣ updateCarrierText: found WFC state" },
+        )
+    }
+
+    fun logUpdateFromStickyBroadcast(plmn: String, spn: String) {
+        buffer.log(
+            TAG,
+            LogLevel.VERBOSE,
+            {
+                str1 = plmn
+                str2 = spn
+            },
+            { "┣ updateCarrierText: getting PLMN/SPN sticky brdcst. plmn=$str1, spn=$str1" },
+        )
+    }
+
+    /** De-structures the info object so that we don't have to generate new strings */
+    fun logCallbackSentFromUpdate(info: CarrierTextCallbackInfo) {
+        buffer.log(
+            TAG,
+            LogLevel.VERBOSE,
+            {
+                str1 = "${info.carrierText}"
+                bool1 = info.anySimReady
+                bool2 = info.airplaneMode
+            },
+            {
+                "┗ updateCarrierText: " +
+                    "result=(carrierText=$str1, anySimReady=$bool1, airplaneMode=$bool2)"
+            },
+        )
+    }
+
+    /**
+     * Used to log the starting point for _why_ the carrier text is updating. In order to keep us
+     * from holding on to too many objects, we'll just use simple ints for reasons here
+     */
+    fun logUpdateCarrierTextForReason(@CarrierTextRefreshReason reason: Int) {
+        buffer.log(
+            TAG,
+            LogLevel.DEBUG,
+            { int1 = reason },
+            { "refreshing carrier info for reason: ${reason.reasonMessage()}" }
+        )
+    }
+
+    companion object {
+        const val REASON_REFRESH_CARRIER_INFO = 1
+        const val REASON_ON_TELEPHONY_CAPABLE = 2
+        const val REASON_ON_SIM_STATE_CHANGED = 3
+        const val REASON_ACTIVE_DATA_SUB_CHANGED = 4
+
+        @Retention(AnnotationRetention.SOURCE)
+        @IntDef(
+            value =
+                [
+                    REASON_REFRESH_CARRIER_INFO,
+                    REASON_ON_TELEPHONY_CAPABLE,
+                    REASON_ON_SIM_STATE_CHANGED,
+                    REASON_ACTIVE_DATA_SUB_CHANGED,
+                ]
+        )
+        annotation class CarrierTextRefreshReason
+
+        private fun @receiver:CarrierTextRefreshReason Int.reasonMessage() =
+            when (this) {
+                REASON_REFRESH_CARRIER_INFO -> "REFRESH_CARRIER_INFO"
+                REASON_ON_TELEPHONY_CAPABLE -> "ON_TELEPHONY_CAPABLE"
+                REASON_ON_SIM_STATE_CHANGED -> "SIM_STATE_CHANGED"
+                REASON_ACTIVE_DATA_SUB_CHANGED -> "ACTIVE_DATA_SUB_CHANGED"
+                else -> "unknown"
+            }
+    }
+}
+
+private const val TAG = "CarrierTextManagerLog"
diff --git a/packages/SystemUI/src/com/android/systemui/log/dagger/CarrierTextManagerLog.kt b/packages/SystemUI/src/com/android/systemui/log/dagger/CarrierTextManagerLog.kt
new file mode 100644
index 0000000..62b80b2
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/log/dagger/CarrierTextManagerLog.kt
@@ -0,0 +1,9 @@
+package com.android.systemui.log.dagger
+
+import javax.inject.Qualifier
+
+/** A [LogBuffer] for detailed carrier text logs. */
+@Qualifier
+@MustBeDocumented
+@Retention(AnnotationRetention.RUNTIME)
+annotation class CarrierTextManagerLog
diff --git a/packages/SystemUI/src/com/android/systemui/log/dagger/LogModule.java b/packages/SystemUI/src/com/android/systemui/log/dagger/LogModule.java
index 9be18ac..66c3c02 100644
--- a/packages/SystemUI/src/com/android/systemui/log/dagger/LogModule.java
+++ b/packages/SystemUI/src/com/android/systemui/log/dagger/LogModule.java
@@ -373,6 +373,16 @@
     }
 
     /**
+     * Provides a {@link LogBuffer} for use by {@link com.android.keyguard.KeyguardUpdateMonitor}.
+     */
+    @Provides
+    @SysUISingleton
+    @CarrierTextManagerLog
+    public static LogBuffer provideCarrierTextManagerLog(LogBufferFactory factory) {
+        return factory.create("CarrierTextManagerLog", 100);
+    }
+
+    /**
      * Provides a {@link LogBuffer} for use by {@link com.android.systemui.ScreenDecorations}.
      */
     @Provides
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileRepositorySwitcher.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileRepositorySwitcher.kt
index eb20bba..991ff56 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileRepositorySwitcher.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/mobile/data/repository/MobileRepositorySwitcher.kt
@@ -21,6 +21,7 @@
 import com.android.settingslib.SignalIcon
 import com.android.settingslib.mobile.MobileMappings
 import com.android.systemui.common.coroutine.ConflatedCallbackFlow.conflatedCallbackFlow
+import com.android.systemui.dagger.SysUISingleton
 import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.demomode.DemoMode
 import com.android.systemui.demomode.DemoModeController
@@ -62,6 +63,7 @@
  */
 @Suppress("EXPERIMENTAL_IS_NOT_ENABLED")
 @OptIn(ExperimentalCoroutinesApi::class)
+@SysUISingleton
 class MobileRepositorySwitcher
 @Inject
 constructor(
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/wifi/data/repository/WifiRepositorySwitcher.kt b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/wifi/data/repository/WifiRepositorySwitcher.kt
index b129617..e96288a 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/wifi/data/repository/WifiRepositorySwitcher.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/pipeline/wifi/data/repository/WifiRepositorySwitcher.kt
@@ -19,6 +19,7 @@
 import android.os.Bundle
 import androidx.annotation.VisibleForTesting
 import com.android.systemui.common.coroutine.ConflatedCallbackFlow.conflatedCallbackFlow
+import com.android.systemui.dagger.SysUISingleton
 import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.demomode.DemoMode
 import com.android.systemui.demomode.DemoModeController
@@ -54,6 +55,7 @@
  */
 @Suppress("EXPERIMENTAL_IS_NOT_ENABLED")
 @OptIn(ExperimentalCoroutinesApi::class)
+@SysUISingleton
 class WifiRepositorySwitcher
 @Inject
 constructor(
diff --git a/packages/SystemUI/tests/src/com/android/keyguard/CarrierTextManagerTest.java b/packages/SystemUI/tests/src/com/android/keyguard/CarrierTextManagerTest.java
index 5557efa..0b9ba782 100644
--- a/packages/SystemUI/tests/src/com/android/keyguard/CarrierTextManagerTest.java
+++ b/packages/SystemUI/tests/src/com/android/keyguard/CarrierTextManagerTest.java
@@ -47,6 +47,7 @@
 import android.testing.AndroidTestingRunner;
 import android.text.TextUtils;
 
+import com.android.keyguard.logging.CarrierTextManagerLogger;
 import com.android.systemui.R;
 import com.android.systemui.SysuiTestCase;
 import com.android.systemui.keyguard.WakefulnessLifecycle;
@@ -96,6 +97,8 @@
     @Mock
     private KeyguardUpdateMonitor mKeyguardUpdateMonitor;
     @Mock
+    private CarrierTextManagerLogger mLogger;
+    @Mock
     private PackageManager mPackageManager;
     @Mock
     private TelephonyManager mTelephonyManager;
@@ -144,7 +147,7 @@
         mCarrierTextManager = new CarrierTextManager.Builder(
                 mContext, mContext.getResources(), mWifiRepository,
                 mTelephonyManager, mTelephonyListenerManager, mWakefulnessLifecycle, mMainExecutor,
-                mBgExecutor, mKeyguardUpdateMonitor)
+                mBgExecutor, mKeyguardUpdateMonitor, mLogger)
                 .setShowAirplaneMode(true)
                 .setShowMissingSim(true)
                 .build();