You can use iCloud to back up all the data of the old mobile phone to iCloud first, and log in to iCloud to integrate the merged data when the new iPhone is activated. The specific steps are as follows:
Operating system: IOS 15.0. 1. ?
Operating software: iCloud. ?
Operating equipment: ipone 1 1. ?
1. Find and open the "Settings" interface on the mobile phone's main screen.
2. Find the logged-in iCloud page.
3. Click to enter iCloud.
4. Select the data to be backed up, and then click the On key on the right.
5. Open the new phone and select Settings to log in to iPhone.
6. After entering the same AppleID account and password, click Next.
7. When logging in to iCloud, a prompt button will appear at the bottom of the screen. Click Merge to complete data backup to the new mobile phone.
Matters needing attention in data transmission of Apple's mobile phone:
When the new iPhone approaches the old iPhone, it can transmit data wirelessly. Moreover, there are three points for attention when using this method: two iPhones must be upgraded to the system of iOS 12.4 or above, and the system of the new iPhone is higher than or equal to that of the old mobile phone. It is best to connect the power supply when transmitting data between two iPhone. Both iPhone must turn on Bluetooth.