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When you turn on your phone, it will automatically choose a network within range. Sometimes though, it might be useful to choose your network manually for example, when you're travelling abroad and there are different networks available. Follow these instructions to choose a network.
Find "Network operators"
Select network manually, go to 2a.
Select network automatically, go to 2b.
2a - Select network manually
Press Search mode.
Your display will tell you if you've access to the network you've chosen. If you don't have access, it's because your operator doesn't have a roaming agreement with the operator in question.