Why I cannot find the 3G connection in Network Panel after inserting the 3G dongle?
To solve the problem, please check the items as follows:

1. 3G SIM card is inserted correctly
2. Valid 3G SIM card is used and make sure the current 3G signal is normal
3. 3G dongle is supported in support list
4. 3G dongle is damaged.
5. Try another USB port of your computer
6. Restart your computer and try again.