diff --git a/radio/1.6/IRadioIndication.hal b/radio/1.6/IRadioIndication.hal
index d9aaa38..c135090 100644
--- a/radio/1.6/IRadioIndication.hal
+++ b/radio/1.6/IRadioIndication.hal
@@ -40,4 +40,17 @@
      *        3. Unsolicited disconnect from either modem or network side.
      */
     oneway dataCallListChanged_1_6(RadioIndicationType type, vec<SetupDataCallResult> dcList);
+
+    /**
+     * The modem can explicitly set SetupDataCallResult::suggestedRetryTime after a failure in
+     * IRadio@1.6::SetupDataCall. During that time, no new calls are allowed to
+     * IRadio@1.6::SetupDataCall that use the same APN.
+     *
+     * When IRadioIndication@1.6::unthrottleApn is sent, AOSP will no longer throttle calls
+     * to IRadio@1.6::SetupDataCall for the given APN.
+     *
+     * @param type Type of radio indication
+     * @param apn Apn to unthrottle
+     */
+    oneway unthrottleApn(RadioIndicationType type, string apn);
 };
diff --git a/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h b/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
index 784bcd9..c0130a4 100644
--- a/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
+++ b/radio/1.6/vts/functional/radio_hidl_hal_utils_v1_6.h
@@ -787,6 +787,9 @@
             RadioIndicationType type,
             const hidl_vec<::android::hardware::radio::V1_6::SetupDataCallResult>& dcList);
 
+    Return<void> unthrottleApn(RadioIndicationType type,
+                               const ::android::hardware::hidl_string& apn);
+
     /* 1.5 Api */
     Return<void> uiccApplicationsEnablementChanged(RadioIndicationType type, bool enabled);
 
diff --git a/radio/1.6/vts/functional/radio_indication.cpp b/radio/1.6/vts/functional/radio_indication.cpp
index 57ee873..b353c82 100644
--- a/radio/1.6/vts/functional/radio_indication.cpp
+++ b/radio/1.6/vts/functional/radio_indication.cpp
@@ -25,6 +25,11 @@
     return Void();
 }
 
+Return<void> RadioIndication_v1_6::unthrottleApn(RadioIndicationType /*type*/,
+                                                 const ::android::hardware::hidl_string& /*apn*/) {
+    return Void();
+}
+
 /* 1.5 Apis */
 Return<void> RadioIndication_v1_6::uiccApplicationsEnablementChanged(RadioIndicationType /*type*/,
                                                                      bool /*enabled*/) {