diff --git a/src/com/android/phone/ImsProvisioningController.java b/src/com/android/phone/ImsProvisioningController.java
index 6a6b155..a62980e 100644
--- a/src/com/android/phone/ImsProvisioningController.java
+++ b/src/com/android/phone/ImsProvisioningController.java
@@ -1564,13 +1564,7 @@
     }
 
     protected int getSubId(int slotId) {
-        final int[] subIds = mSubscriptionManager.getSubscriptionIds(slotId);
-        int subId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
-        if (subIds != null && subIds.length >= 1) {
-            subId = subIds[0];
-        }
-
-        return subId;
+        return SubscriptionManager.getSubscriptionId(slotId);
     }
 
     protected int getSlotId(int subId) {
diff --git a/src/com/android/services/telephony/rcs/TelephonyRcsService.java b/src/com/android/services/telephony/rcs/TelephonyRcsService.java
index 3a8ad62..f6ba40b 100644
--- a/src/com/android/services/telephony/rcs/TelephonyRcsService.java
+++ b/src/com/android/services/telephony/rcs/TelephonyRcsService.java
@@ -366,16 +366,7 @@
     }
 
     private int getSubscriptionFromSlot(int slotId) {
-        SubscriptionManager manager = mContext.getSystemService(SubscriptionManager.class);
-        if (manager == null) {
-            Log.w(LOG_TAG, "Couldn't find SubscriptionManager for slotId=" + slotId);
-            return SubscriptionManager.INVALID_SUBSCRIPTION_ID;
-        }
-        int[] subIds = manager.getSubscriptionIds(slotId);
-        if (subIds != null && subIds.length > 0) {
-            return subIds[0];
-        }
-        return SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+        return SubscriptionManager.getSubscriptionId(slotId);
     }
 
     /**