Joke Collection Website - Public benefit messages - What about the original information after changing the calling card?

What about the original information after changing the calling card?

Back up the mobile phone data, terminate the service, and take out the SIM card and SD card.

1. Back up mobile phone data: Before cleaning the mobile phone, back up all data to ensure that all data is stored in the cloud or computer.

2. Termination of service: contact the service provider to terminate the service or switch the service item to a new mobile phone.

3. Take out the SIM card and SD card: Take out or delete the data on the SIM card and SD card. A lot of information is stored on the SIM card. Even if it has been restored to the factory, the data on the SIM card will not be cleared.