Iphone sends a text message to remind you of your last use (unavailable).

2. Enter the settings and click on the top avatar;

3. Go to the AppleID page and slide the phone screen up;

4. Locate and click Logout at the bottom of the AppleID page;

5. Jump out of the login AppleID dialog box, enter the AppleID password, and click Finish in the upper right corner. When you quit the Apple phone, you will no longer show the last time you used it.

If you see a warning when sending a message, or you can't send or receive a message, please know what to do. Restart the device: iPhone. Check the network connection. To send messages as iMessage messages or MMS messages, you need to use cellular data or Wi-Fi connection. To send SMS, you need a mobile phone network connection. If you turn on the Wi-Fi calling function, you can send short messages through Wi-Fi.

Please ask your operator whether the type of information you are trying to send (such as MMS or SMS) is supported. If you are trying to send a group multimedia message on the iPhone, go to settings > messages, and then turn on "send and receive multimedia messages". If you don't see the option to turn on "Send and Receive MMS" or "Group Info" on the iPhone, your operator may not support this feature.

Make sure your device has enough space to receive images and videos. Make sure that you have entered the correct contact phone number or email address.