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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.
Connect your USB modem and your computer
Find "Search for networks"
Click the drop down list.
The screen will tell you if you have access to the network you've chosen.