If your mobile phone cannot access the Internet normally, please check the following:
1, confirm whether the phone parameters have been set;
2, confirm whether there is a network, it is recommended that you can use in places with strong signals;
3, check whether there is a problem with the mobile phone, it is recommended that you can change the machine test;
4, check whether the USIM card is inserted, if it is inserted but still cannot be used, it is recommended that you go to the business hall to check whether the USIM card is faulty, or change the card test.
If the above situation is not solved, you can contact the local manual customer service.
Maybe your phone company shut down your network because you didn't pay your bill. You didn't refresh it in time after you paid. I suggest you call the communications company and ask them to refresh the back office.