Consulting customer service
If you encounter problems with Apple's mobile phone, you should consult Apple's customer service as soon as possible to reflect the situation. Don't disassemble the mobile phone or go to other repair points for repair without authorization. Most of them are not guaranteed after being disassembled.
Do not erase data.
Also, don't erase your data on icloud, or you will be beaten by customer service to unfreeze it.
Go to the regular after-sales service center for testing.
If there is something wrong with Apple's mobile phone, you can go directly to Xi Anqike Apple after-sales service center to test the mobile phone. According to Bian Xiao's experience, it should be that the baseband is broken and needs to be returned to the factory for replacement. The machine can only be free during the warranty period.
Inquire about after-sales service outlets
After-sales outlets can consult customer service or Baidu. If they return to the factory for maintenance and don't have a spare machine for their own use, they have to prepare it themselves.