diff --git a/api/test-current.txt b/api/test-current.txt
index 14ffb06941ad7..b73e8e051f300 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -1546,6 +1546,7 @@ package android.telephony {
 
   public class TelephonyManager {
     method public int getCarrierIdListVersion();
+    method @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE) public String getLine1AlphaTag();
     method public android.util.Pair<java.lang.Integer,java.lang.Integer> getRadioHalVersion();
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void refreshUiccProfile();
     method public void setCarrierTestOverride(String, String, String, String, String, String, String);
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 615138d66593e..9834bda0f8bd7 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -3733,6 +3733,7 @@ public class TelephonyManager {
      * @hide
      * nobody seems to call this.
      */
+    @TestApi
     @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE)
     public String getLine1AlphaTag() {
         return getLine1AlphaTag(getSubId());