diff --git a/telephony/java/android/telephony/NetworkService.java b/telephony/java/android/telephony/NetworkService.java
index 87d94bfda6626..c75de42707a6b 100644
--- a/telephony/java/android/telephony/NetworkService.java
+++ b/telephony/java/android/telephony/NetworkService.java
@@ -234,6 +234,9 @@ public abstract class NetworkService extends Service {
      * this method to facilitate the creation of {@link NetworkServiceProvider} instances. The system
      * will call this method after binding the network service for each active SIM slot id.
      *
+     * This methead is guaranteed to be invoked in {@link NetworkService}'s internal handler thread
+     * whose looper can be retrieved with {@link Looper.myLooper()} when override this method.
+     *
      * @param slotIndex SIM slot id the network service associated with.
      * @return Network service object. Null if failed to create the provider (e.g. invalid slot
      * index)
diff --git a/telephony/java/android/telephony/data/DataService.java b/telephony/java/android/telephony/data/DataService.java
index 6c4e7ce51ebf9..f56bbe13051c3 100644
--- a/telephony/java/android/telephony/data/DataService.java
+++ b/telephony/java/android/telephony/data/DataService.java
@@ -458,6 +458,9 @@ public abstract class DataService extends Service {
      * this method to facilitate the creation of {@link DataServiceProvider} instances. The system
      * will call this method after binding the data service for each active SIM slot id.
      *
+     * This methead is guaranteed to be invoked in {@link DataService}'s internal handler thread
+     * whose looper can be retrieved with {@link Looper.myLooper()} when override this method.
+     *
      * @param slotIndex SIM slot id the data service associated with.
      * @return Data service object. Null if failed to create the provider (e.g. invalid slot index)
      */