How to synchronize text messages between iphone

Use the same Apple ID, and then turn on the iMessage function. Take the iPhone 7 as an example. The specific method is as follows:

First click the "Settings" icon on the phone desktop, as shown in the figure below.

2. After entering the phone setting interface, drop down the menu, and then select the "Information" option, as shown in the figure below.

3. Finally, turn on the switch in the "iMessage" column in the information interface; Then repeat the above operation on another iPhone.