diff --git a/app/src/main/java/com/example/notifyservice/MainActivity.java b/app/src/main/java/com/example/notifyservice/MainActivity.java
index 2f9e6d4..0a570b0 100644
--- a/app/src/main/java/com/example/notifyservice/MainActivity.java
+++ b/app/src/main/java/com/example/notifyservice/MainActivity.java
@@ -552,11 +552,16 @@ public class MainActivity extends AppCompatActivity implements PostRequestCallba
                 public void onReceiveUssdResponse(TelephonyManager telephonyManager, String request, CharSequence response) {
                     super.onReceiveUssdResponse(telephonyManager, request, response);
                     String responseString = response.toString();
-                    if (finalSmsResponse){
-                        receivingSms = true;
+                    if(!finalSmsResponse){
+                        String extractedNumber = extractFirstPhoneNumber(responseString);
+                        if (extractedNumber.isEmpty()) {
+                            receivingSms = true;
+                        } else {
+                            phone.setPhone(extractFirstPhoneNumber(responseString));
+                            savePhone(getBaseContext(), phone);
+                        }
                     } else {
-                        phone.setPhone(extractFirstPhoneNumber(responseString));
-                        savePhone(getBaseContext(), phone);
+                        receivingSms = true;
                     }
                 }