1, there is something wrong with Apple's mobile phone network settings. You can change to a place with better signal, disconnect WiFi or reconnect 4g.

2. The version of Apple's mobile phone system is too low to support the problem that the system version is too low. You need to update the version of Apple's mobile phone system to the latest version before downloading.

3.appleid account problem. The appleid account is not registered or the activation information of the appleid account is incomplete. Without an AppleID, the software cannot be downloaded. The solution is to register an appleid account and download it when you come back.

4. There is a problem with the network dns server, which can be solved by changing the ip address of the specified dns server. Open the wireless network management of mobile phone, click the "I" symbol to modify it, and change the IP address of DNS inside to 8.8.8.8 or 1 14.34338+06. 46338.66666666666