I9 100 can't surf the Internet.

First of all, we must judge whether it is a mobile phone problem or a network problem.

You can walk 300 meters from home. The signal is currently occupied by other base stations. If you can, then the signal attenuation near your home is very large, and there may be obstacles, repeaters, signal reflectors, etc. Nearby. Call the operator to complain.

If the problem is the same everywhere:

1. Is there an error prompt? Is the error prompt ID3 or ID40?

2. Call the operator and send the correct mobile phone configuration to your mobile phone via SMS. You can select an application in the SMS.