1. Find "Network operators"
2. Choose option
Select network manually, go to 2a.
Select network automatically, go to 2b.
3. 2a - Choose network manually
A list of available networks is displayed.
Press the required network.
After a moment the display shows whether you have access to the selected network. If the display shows that you do not have access to the selected network, it is because your network operator does not have a roaming agreement with the network operator in question.