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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 internet.
Find "Mobile Connections"
Your USB modem now searches for networks within range and a list of options is displayed.
The screen will tell you if you have access to the network you've chosen.