Dans mail écran cache fonction écrire un message

You're referring to the "Screen Lock" or "Lock Screen" feature on Android devices, which allows you to set a message that will be displayed when the screen is locked.

To set a message on the lock screen on an Android device, follow these steps:

1. Go to your device's Settings app.
2. Scroll down and select "Security" or "Lock screen" (the exact option may vary depending on your device and Android version).
3. Look for the option "Lock screen message" or "Screen lock message" and select it.
4. Enter the message you want to display on the lock screen. You can use plain text or format the text using the available options (e.g., bold, italic, etc.).
5. Tap "Save" or "OK" to save the changes.

The message will now be displayed on the lock screen whenever the screen is locked. Note that the exact steps may vary depending on your device and Android version, so if you're having trouble finding the option, you can try searching for "lock screen message" in your device's settings app.