* For making mobile phone calls and use of mobile internet outside Luxembourg your Apple iPhone 4 S standardly selects the network with the best reception and most attractive tarriffs. This is called roaming.
* Therefore, keep the network selection option preferably set to automatically on your Apple iPhone 4 S .
* To manually select a different network, click *Next* for instructions.
* Go to the Start screen.
* Choose *Settings*.
* The Apple iPhone 4 S is now searching for available networks.
* Choose the Tango network.
* The Apple iPhone 4 S has been logged onto the selected network.
* Return to the Start screen.