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You can set your device to find a network automatically or you can select a network manually. Follow these instructions to select a network.
You need to deactivate data connections before you can select a network. Click here for information on how to deactivate data connections.
Find "Network operators"
Select one of the following options:
Select network manually, go to 2a.
Select network automatically, go to 2b.
2a - Select network manually
Press the required network.
Your display will tell you if you have access to the network you've chosen.