An SMS is a text message which can be sent to other mobile phones. You'll be able to send and receive SMS as soon as you've inserted your SIM card into your mobile phone. If this isn't the case, you can set up your mobile phone for SMS manually.
Press the dots in the bottom right corner of the display.
Save the message centre number
Press the field below "SMS centre number".
Key in +41794999000 and press save.
Return to the Home screen
Press the Home key to end the session and return to the Home screen.