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You can set your tablet to select a network automatically or you can select a network manually. If you select a network manually, your tablet will lose network connection when the selected network is out of reach.
1. Find "Network operators"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Mobile networks.
Press Network operators.
2. Select network
Press Search networks and your tablet will search for networks.
Press the required network.
If you want to select a network automatically, press Select automatically.
3. Return to the home screen
Press the Home key to return to the home screen.