A pop-up window appears on Apple's mobile phone.

The pop-up window that appears on Apple's mobile phone is as follows.

1. The mobile phone has not verified the AppleID for a long time.

2.AppStore account login has timed out or expired.

3. There are security risks in the 3.AppleID account. The solution to the situation is to check whether the time setting of the mobile phone is correct first.

4. Open the application for setting up WLAN to use WLAN and cellular network, and then select Settings. The solution to check the situation is to log out of AppleID first, and then log in again.