Huawei Y7
Android 7.0
1 Find "SMS centre no."
Press the message icon.
Press More.
Press Settings.
Press Advanced.
Press SMS centre no..
2 Set the message centre number
Press the text input field.
Key in +6421600600 and press the confirm icon.
+6421600600
3 Return to the home screen
Press the Home key to return to the home screen.