How to back up iphone when changing mobile phones?

1. Use iTunes for backup. Download an itunes from the computer, connect to the iPhone, right-click the device, and then select "Back up to this computer" on the pop-up page. At this point, the information of the old iPhone has been backed up in iTunes. Next time you take out a new iPhone, please connect to iTunes, right-click and select "Restore from Backup" to restore the data.

2. use iCould backup. Open the settings of the mobile phone, select iCould, log in to apple id after entering, select the contents to be backed up, and then click "Back Up Now" to upload the mobile phone data. The next time you restore, please log in to your iCould account with your new iphone, and then click Restore Backup.

3. If you switch to an Android phone, it is recommended to use the third-party software 360 Mobile Guardian for backup. After downloading the 360 mobile phone, open the address book manager of the software, register a new account and select backup. The next time you need to restore data, please download 360 Mobile Guardian on your new phone and log in, and then click Restore Backup (only backup address book is supported).