The small lock icon in WeChat means that WeChat is locked, but the program will always keep running in the background. The small lock is mainly to protect the personal privacy of the mobile phone owner.

Take Xiaomi mobile phones as an example. Just hold down the program icon you want to keep and drag it down. When a small lock icon appears, let go and it will be locked.

It means it has been locked. When the phone closes the background program, WeChat will not close. The method to unlock is to hold down WeChat in the background and pull down to unlock (or lock).

The unlocking method is as follows:

(1) First enter the mobile phone desktop and find the locked WeChat icon.

(2) Press and hold the locked WeChat icon with your finger and drag it downward until an open lock icon appears on the screen and then release your finger.

(3) At this time, you will see that the small lock icon of WeChat is gone.