How to turn off the unlocking function of SMS address book?

1. First, click the "Settings" icon on the desktop to enter the setting interface 2. Then, find "Information" in the menu item and click Enter. 3. In the Info submenu, find "iMessage" and check the status of the corresponding button. 4. If iMessage is on and the button status is "On" (green button), click the button to change it. Finally, after turning off the button, when you enter the SMS sending interface, you will find that there is no prompt about iMessage, indicating that this function has been turned off.