Samsung Galaxy A70
Android 9.0
Select help topic
1 Find "Text messages"
Press the message icon.
Press the menu icon.
Press Settings.
Press More settings.
Press Text messages.
2 Set the message centre number
Press "Message Centre" below the required SIM.
Key in +447785014317 and press Set.
+447785014317
3 Return to the home screen
Press the Home key to return to the home screen.