* Your device may need extra settings if you want to send SMS messages with your Tango SIM card.
* Click *Next* for step-by-step instructions on how to manually set up the SMS centre on your Apple iPhone 4 S.
* Go to the Start screen.
* Choose *Phone*.
* Enter *==*#5005*7672#*, and choose *Call*.
* If the displayed phone number is +352091000030, choose *Dismiss*. Return to the Start screen.
* If the phone numbers do not match, choose *Dismiss*, and go to the next step.
* Enter *==**5005*7672*+352091000030#*, and choose *Call*.
* The SMS centre has been activated.
* Return to the Start screen.
* Start screen.
* The Apple iPhone 4 S can now be used for receiving and sending SMS messages in Luxembourg and abroad.