diff --git a/java/com/android/dialer/duo/Duo.java b/java/com/android/dialer/duo/Duo.java
index 839c1d3..ff694c0 100644
--- a/java/com/android/dialer/duo/Duo.java
+++ b/java/com/android/dialer/duo/Duo.java
@@ -31,6 +31,12 @@
 
   boolean isEnabled();
 
+  /**
+   * @return true if Duo is installed and the user has gone through the set-up flow confirming their
+   *     phone number.
+   */
+  boolean isActivated(@NonNull Context context);
+
   @MainThread
   boolean isReachable(@NonNull Context context, @Nullable String number);
 
diff --git a/java/com/android/dialer/duo/stub/DuoStub.java b/java/com/android/dialer/duo/stub/DuoStub.java
index 82b9c79..7cc8f78 100644
--- a/java/com/android/dialer/duo/stub/DuoStub.java
+++ b/java/com/android/dialer/duo/stub/DuoStub.java
@@ -40,6 +40,11 @@
     return false;
   }
 
+  @Override
+  public boolean isActivated(@NonNull Context context) {
+    return false;
+  }
+
   @MainThread
   @Override
   public boolean isReachable(@NonNull Context context, @Nullable String number) {