Samsung Galaxy S21 5G
Set up your phone for text messaging
A text message is a message that can be sent to other mobile phones. Your phone can send and receive text messages as soon as you've inserted your SIM. If this isn't the case, you can set up your phone for text messaging manually.
Slide your finger upwards on the screen.
Press Samsung.
Press Messages.
Press the menu icon.
Press Settings.
Press More settings.
Press Text messages.
Press Message Centre below the required SIM.
Key in +6421600600 and press Set.
Press the Home key to return to the home screen.
1. 1. Find "Message Centre"
2. 2. Set the message centre number
3. 3. Return to the home screen