What is the safest way to deal with used mobile phones?

First, the old mobile phone security processing method:

After the important data is backed up, restore the factory settings or format the phone.

Access some irrelevant content or large files (such as movies, useless pictures, etc.). ) many times, and fill the storage space of the mobile phone.

Install a "file shredder" on your mobile phone to completely erase it, or go to a regular mobile phone recycling agency or maintenance center to ask professionals to completely destroy the mobile phone data.

If the phone has a memory card, try to put private files in the memory card. When changing a mobile phone, just take out the memory card and plug in a new mobile phone.

Never throw away your mobile phone as domestic garbage.

The safest way is: don't store important personal information in your mobile phone.

Second, please pay attention to these when canceling the mobile phone number.

Unbind AliPay account

Login to Alipay account → Click account settings → Basic information → Mobile phone → Unbind.

Unbind WeChat account

Log in to WeChat and select "Me" → Settings → Account and Security → Mobile phone number → Select the menu in the upper right corner → Unbind.

Unbind bank card

Generally, it can be untied through online banking professional edition or bank counter, and at the same time, the business numbers of bank cards such as U shield, online banking, mobile banking and SMS notification can be changed.

Third, change the login settings of other accounts.

Replace the mobile phone number bound by social accounts such as Weibo;

Replace the number bound by shopping websites such as Taobao;

Change the mobile phone binding number on the mailbox;

Change the relevant business numbers of securities and fund accounts;

Change the mobile phone number of common websites such as 12306.