diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 83b909852d8f3..0921834436bda 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -16355,6 +16355,7 @@ public class TelephonyManager {
 
     /**
      * Setup sIPhoneSubInfo for testing.
+     *
      * @hide
      */
     @VisibleForTesting
@@ -16365,9 +16366,21 @@ public class TelephonyManager {
     }
 
     /**
-     * Whether device can connect to 5G network when two SIMs are active.
+     * Setup sISub for testing.
+     *
      * @hide
-     * TODO b/153669716: remove or make system API.
+     */
+    @VisibleForTesting
+    public static void setupISubForTest(ISub iSub) {
+        synchronized (sCacheLock) {
+            sISub = iSub;
+        }
+    }
+
+    /**
+     * Whether device can connect to 5G network when two SIMs are active.
+     *
+     * @hide TODO b/153669716: remove or make system API.
      */
     public boolean canConnectTo5GInDsdsMode() {
         ITelephony telephony = getITelephony();