diff --git a/api/test-current.txt b/api/test-current.txt
index 3f26ab094ce98..b59eaccf78236 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -1207,6 +1207,7 @@ package android.telephony {
 
   public class TelephonyManager {
     method public int getCarrierIdListVersion();
+    method public boolean isRttSupported();
     method public void refreshUiccProfile();
     method public void setCarrierTestOverride(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String);
     field public static final int UNKNOWN_CARRIER_ID_LIST_VERSION = -1; // 0xffffffff
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 90d27c8d76a93..e5c4ccda422a0 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -7444,6 +7444,27 @@ public class TelephonyManager {
         return false;
     }
 
+    /**
+     * Determines whether the device currently supports RTT (Real-time text). Based both on carrier
+     * support for the feature and device firmware support.
+     *
+     * @return {@code true} if the device and carrier both support RTT, {@code false} otherwise.
+     * @hide
+     */
+    @TestApi
+    public boolean isRttSupported() {
+        try {
+            ITelephony telephony = getITelephony();
+            if (telephony != null) {
+                return telephony.isRttSupported(mSubId);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "Error calling ITelephony#isRttSupported", e);
+        } catch (SecurityException e) {
+            Log.e(TAG, "Permission error calling ITelephony#isWorldPhone", e);
+        }
+        return false;
+    }
     /**
      * Whether the phone supports hearing aid compatibility.
      *
diff --git a/telephony/java/com/android/internal/telephony/ITelephony.aidl b/telephony/java/com/android/internal/telephony/ITelephony.aidl
index 3938535c2141f..b20b164e46d50 100644
--- a/telephony/java/com/android/internal/telephony/ITelephony.aidl
+++ b/telephony/java/com/android/internal/telephony/ITelephony.aidl
@@ -1054,6 +1054,8 @@ interface ITelephony {
      */
     boolean isTtyModeSupported();
 
+    boolean isRttSupported(int subscriptionId);
+
     /**
      * Whether the phone supports hearing aid compatibility.
      *