After Apple changed its mobile phone number, the trusted mobile phone number that can't be applied for was changed to the current one, but it still doesn't work.

Turn on wifi, enter the Apple ID in Settings -iTunes Store and App Store-Next, turn on the green switch of the app, log off or log off the current ID, and log on again. Go to the App Store to download the software. When the following message prompts, click Send SMS. Even if you don't need this number, follow the steps. After that, Alipay will send a verification code. After entering this verification code, the software can be successfully downloaded. After downloading other software, the same verification steps will not occur.