How to send a text message from one iphone to another?

Two iphones use the same Apple ID, and then open the message * * * to enjoy it. Here, take the iPhone 7 as an example, and the specific methods are as follows:

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

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

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