diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index d214006edaac815f047a96765c82b5ae26c88210..9a5652ab0cb71c1693a433cc32bd5e86802217b1 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -14688,6 +14688,7 @@ package android.telephony {
     method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isLteCdmaEvdoGsmWcdmaEnabled();
     method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isMobileDataPolicyEnabled(int);
     method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isNrDualConnectivityEnabled();
+    method @FlaggedApi("com.android.internal.telephony.flags.enable_modem_cipher_transparency") @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isNullCipherNotificationsEnabled();
     method @Deprecated @RequiresPermission(anyOf={android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE, android.Manifest.permission.READ_PHONE_STATE}) public boolean isOffhook();
     method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isOpportunisticNetworkEnabled();
     method @Deprecated @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isPotentialEmergencyNumber(@NonNull String);
@@ -14727,6 +14728,7 @@ package android.telephony {
     method @Deprecated @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setDataEnabled(int, boolean);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setDataRoamingEnabled(boolean);
     method @FlaggedApi("com.android.internal.telephony.flags.enable_identifier_disclosure_transparency") @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setEnableCellularIdentifierDisclosureNotifications(boolean);
+    method @FlaggedApi("com.android.internal.telephony.flags.enable_modem_cipher_transparency") @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setEnableNullCipherNotifications(boolean);
     method @NonNull @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public android.telephony.PinResult setIccLockEnabled(boolean, @NonNull String);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setMobileDataPolicyEnabled(int, boolean);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setMultiSimCarrierRestriction(boolean);
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 1b47dfe0eba168f136df4f7c28d97e3fb621f923..0dce0844ce64a4f108bfc5fab10f747f00dc8ca6 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -18922,6 +18922,62 @@ public class TelephonyManager {
         return false;
     }
 
+    /**
+     * Enables or disables notifications sent when cellular null cipher or integrity algorithms
+     * are in use by the cellular modem.
+     *
+     * @throws IllegalStateException if the Telephony process is not currently available
+     * @throws SecurityException if the caller does not have the required privileges
+     * @throws UnsupportedOperationException if the modem does not support reporting on ciphering
+     * and integrity algorithms in use
+     * @hide
+     */
+    @FlaggedApi(Flags.FLAG_ENABLE_MODEM_CIPHER_TRANSPARENCY)
+    @RequiresPermission(Manifest.permission.MODIFY_PHONE_STATE)
+    @SystemApi
+    public void setEnableNullCipherNotifications(boolean enable) {
+        try {
+            ITelephony telephony = getITelephony();
+            if (telephony != null) {
+                telephony.setEnableNullCipherNotifications(enable);
+            } else {
+                throw new IllegalStateException("telephony service is null.");
+            }
+        } catch (RemoteException ex) {
+            Rlog.e(TAG, "setEnableNullCipherNotifications RemoteException", ex);
+            ex.rethrowFromSystemServer();
+        }
+    }
+
+    /**
+     * Get whether notifications are enabled for null cipher or integrity algorithms in use by the
+     * cellular modem.
+     *
+     * @throws IllegalStateException if the Telephony process is not currently available
+     * @throws SecurityException if the caller does not have the required privileges
+     * @throws UnsupportedOperationException if the modem does not support reporting on ciphering
+     * and integrity algorithms in use
+     * @hide
+     */
+    @FlaggedApi(Flags.FLAG_ENABLE_MODEM_CIPHER_TRANSPARENCY)
+    @RequiresPermission(Manifest.permission.READ_PRIVILEGED_PHONE_STATE)
+    @SystemApi
+    public boolean isNullCipherNotificationsEnabled() {
+        try {
+            ITelephony telephony = getITelephony();
+            if (telephony != null) {
+                return telephony.isNullCipherNotificationsEnabled();
+            } else {
+                throw new IllegalStateException("telephony service is null.");
+            }
+        } catch (RemoteException ex) {
+            Rlog.e(TAG, "isNullCipherNotificationsEnabled RemoteException", ex);
+            ex.rethrowFromSystemServer();
+        }
+        return false;
+    }
+
+
     /**
      * Get current cell broadcast message identifier ranges.
      *
diff --git a/telephony/java/com/android/internal/telephony/ITelephony.aidl b/telephony/java/com/android/internal/telephony/ITelephony.aidl
index 9b5ee0cd82f3c54796f18ea2a5bfaf96cc901fcf..c7ffe50f98b25802ee336bc0aefa51f31fe8caeb 100644
--- a/telephony/java/com/android/internal/telephony/ITelephony.aidl
+++ b/telephony/java/com/android/internal/telephony/ITelephony.aidl
@@ -3230,4 +3230,32 @@ interface ITelephony {
     @JavaPassthrough(annotation="@android.annotation.RequiresPermission("
         + "android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE)")
     boolean isCellularIdentifierDisclosureNotificationsEnabled();
+
+    /**
+     * Enables or disables notifications sent when cellular null cipher or integrity algorithms
+     * are in use by the cellular modem.
+     *
+     * @throws IllegalStateException if the Telephony process is not currently available
+     * @throws SecurityException if the caller does not have the required privileges
+     * @throws UnsupportedOperationException if the modem does not support reporting on ciphering
+     * and integrity algorithms in use
+     * @hide
+     */
+    @JavaPassthrough(annotation="@android.annotation.RequiresPermission("
+        + "android.Manifest.permission.MODIFY_PHONE_STATE)")
+    void setEnableNullCipherNotifications(boolean enable);
+
+    /**
+     * Get whether notifications are enabled for null cipher or integrity algorithms in use by the
+     * cellular modem.
+     *
+     * @throws IllegalStateException if the Telephony process is not currently available
+     * @throws SecurityException if the caller does not have the required privileges
+     * @throws UnsupportedOperationException if the modem does not support reporting on ciphering
+     * and integrity algorithms in use
+     * @hide
+     */
+    @JavaPassthrough(annotation="@android.annotation.RequiresPermission("
+        + "android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE)")
+    boolean isNullCipherNotificationsEnabled();
 }