What does "write contacts" and "write text messages" mean in mobile phone permissions? Why do I need to turn on the "write contacts" permission to back up my address book?

In fact, almost all software applications will read your address book contacts. Functionally speaking, reading contacts can determine whether any of your friends and relatives use the same application. For example, if there is a "Mobile Contact" in WeChat's "Add Friends", you need to use the permissions of the mobile phone address book. Through this permission, you can see who in your address book is also using WeChat, making it easy to add friends. Of course, the address book is a relatively sensitive permission. Regular applications can be used normally if you don't give it this permission, but functions like finding friends in the address book cannot be turned on.

This is true for reading and writing locations, reading and writing text messages, voice, and video recording