1, the system cellular network is shut down, resulting in: Step 1, find the setting icon of the mobile phone on the screen of the iPhone, and click Enter.

Step 2: After entering the setting interface of the mobile phone, find the cellular mobile network option in the interface and click Enter.

Step 3, after entering the cellular mobile network interface, find the Apple Store option in the interface to see if the cellular data in the Apple Store is closed. If it is closed, click the Apple Store option, and then select the WLAN and cellular options in the interface to open it.

2. Cause of system error: Press and hold the power button of the mobile phone to turn it off, and then restart the mobile phone. After the phone is started, check in the Apple Store to see if the download software of the app is back to normal.

3. Network connection error: It is recommended to disconnect the connected wifi and reconnect.