According to Apple's customer service in official website, this problem is caused by the problem of Apple's mobile phone network settings. Please follow the following steps.
First, open the settings drop-down to find Safari.
Second, open Safari, drop down to find the history and website data, and click.
Third, go back to the settings, find iTunesstore and Appstore, and click Open.
4. Click on the AppleID at the top, and select Exit Login in the pop-up interface.
5. Open the Settings-General-option, select Restore Network Settings, and the phone will restart.
Sixth, re-link WiFi. Settings -WLAN- Click the exclamation point to the right of the linked WiFi.
7. Click Configure DNS in WiFi settings, set DNS to manual, add servers, and set IP to11116.5438+04.165438 or 8.8.8.8.
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