Samsung Galaxy S21 Ultra
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It's not possible to send and receive text messages
Solution 2 of 3: The message centre number is incorrect
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 +447958879879 and press Set.
Press the Home key to return to the home screen.