Why is Apple's mobile phone disconnected?

Take iphone 1 1 and IOS 14.2 as examples, and the specific operation methods are as follows:

1. There may be a problem with the system settings of the mobile phone. Click the settings of the mobile phone, find and click the flight mode option in the interface, turn on the flight mode and wait for a few minutes, then turn off the flight mode and reopen the data connection.

2. Maybe the SIM card in the mobile phone is broken. Take out the SIM card from your mobile phone and see if it is damaged. If it is damaged, contact the operator in time to replace the new SIM card.

3. If the system version is too old, it may lead to frequent network disconnection. Open the phone settings, find and open the general options in the interface, click System Update at the top of the general interface, and then wait for the system to update automatically.

4. Check whether the functions of WLAN and cellular mobile network are turned on by the mobile phone application. If not, the network will be disconnected. Enter the mobile phone settings, find the wireless LAN option, select the application using WLAN and cellular mobile network after opening, and check whether the application has turned on this function in the interface.

It should be noted that this answer applies to most models of Apple phones.