Why I cannot connect to 3G network?
To solve the problem, please check the items as follows:

1. Valid 3G SIM card is used and make sure the current 3G signal is normal
2. Valid APN, user name or password is inputted when setup a new 3G connection.
3. Enough deposit in your SIM card
4. Insert the 3G dongle again, and then click the Connect button.