What's the matter with Apple's mobile phone suddenly being able to access the Internet but not making phone calls?

Open the mobile phone network data, but still can't access the Internet:

1. restart the iPhone.

2.Set-General-Restore, check the WAP access point description file, and delete it if there is any suggestion.

3. restore network settings, tap settings > general > restore, then scroll down and tap restore network settings.

4. If I put this SIM card in another mobile phone, can I surf the Internet? If you put another SIM card into this iPhone, can you surf the Internet, which further eliminates the problem of mobile phone or SIM card.

5. restore all settings, tap settings > general > restore, then scroll down and tap restore all settings.

6. If you still can't access the Internet, you can back up the data, close the search for my iPhone, and then restore the iPhone system.