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.
Find "SMS / MMS"
Press the Menu key.
Press the SMS / MMS tab.
Save the message centre number
Press Message centre.
Key in +41794999000 and press OK.
Return to the Home screen
Press the Home key to end the session and return to the Home screen.