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You can set your USB modem to select a network automatically or you can select a network manually. Remember, if you select a network manually, your USB modem will lose network connection when the selected network is out of reach. Remember, you need to end your connection to the internet.
Select network manually, go to 2a.
Select network automatically, go to 2b.
2a - Select network manually
Your USB modem searches for networks within range.
Follow the instructions on the screen to select the required network.
The screen will tell you if you have access to the network you've chosen.