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Apple 12 calls do not display the area code. What happened?

The reason is a system BUG, which can be fixed by upgrading the system. Some users can solve it by the following methods.

1, open the settings in the phone.

3. Select the cellular network and enter the network settings in the phone settings.

4. Then slide down in the cellular network settings to find the phone option you want to enter.

5. Change the data used by the phone to WLAN and cellular network.