How to prevent SMS sharing between iPhone

This is because information synchronization in iCloud is turned on. The solution is to turn off information synchronization in iCloud. The specific steps are as follows:

First, turn on the phone, find "Settings" on the phone desktop, and then click Enter.

Secondly, after entering the settings, find the top column of "Apple ID, iCloud, iTunes and App Store", and then click Enter.

3. After entering Apple ID, iCloud, iTunes and App Store, find the "iCloud" item and click Enter.

Fourth, after entering iCloud, find the "information" column and close it to solve this problem.