diff --git a/src/java/com/android/internal/telephony/SmsDispatchersController.java b/src/java/com/android/internal/telephony/SmsDispatchersController.java
index cc287f805544eadd97df33c00559985f2138baec..10844894bb9a16d3abda21fd46d7b2cf81f70e79 100644
--- a/src/java/com/android/internal/telephony/SmsDispatchersController.java
+++ b/src/java/com/android/internal/telephony/SmsDispatchersController.java
@@ -137,6 +137,8 @@ public class SmsDispatchersController extends Handler {
     private final Context mContext;
     private final @NonNull FeatureFlags mFeatureFlags;
 
+    private TelephonyManager mTelephonyManager;
+
     /** true if IMS is registered and sms is supported, false otherwise.*/
     private boolean mIms = false;
     private String mImsSmsFormat = SmsConstants.FORMAT_UNKNOWN;
@@ -657,9 +659,24 @@ public class SmsDispatchersController extends Handler {
         }
     }
 
+
     private void updateImsInfo(AsyncResult ar) {
         int[] responseArray = (int[]) ar.result;
-        setImsSmsFormat(responseArray[1]);
+        int mcc, mnc;
+
+        mTelephonyManager = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE);
+
+        String carrierMccMnc = mTelephonyManager.getNetworkOperator();
+
+	Rlog.d(TAG, "Fetched MCCMNC: " + carrierMccMnc);
+
+        if ("20820".equals(carrierMccMnc) || "26003".equals(carrierMccMnc)) {
+            setImsSmsFormat(PhoneConstants.PHONE_TYPE_GSM); // Sets 3GPP format
+            Rlog.d(TAG, "Forced GSM format for carrier: " + carrierMccMnc);
+        } else {
+            setImsSmsFormat(responseArray[1]);
+        }
+
         mIms = responseArray[0] == 1 && !SmsConstants.FORMAT_UNKNOWN.equals(mImsSmsFormat);
         Rlog.d(TAG, "IMS registration state: " + mIms + " format: " + mImsSmsFormat);
     }