How to Set Up a 3G Modem Connection:
1. Plug your modem into your PC. Your modem software should open automatically.
2. Go to the network settings and select Manual.
3. Select the desired network and create a new connection for your network.
4. Set this as your default connection and then exit the settings.
5. Now, insert the other SIM card for which you've created the connection.
6. Plug the modem back in. It may display an "Invalid SIM" message. Don't worry—just drag the message to a corner instead of clicking "OK."
7. Now, go to Network Connections on your PC. You should see the 3G modem connection listed there.
8. Double-click the connection and enter the dial-up number *99#, then press Dial.
You should now be successfully connected to the internet.