Open the Messages app
Tap your profile icon or menu
Go to Messages settings
Tap RCS chats, Chat features, or Advanced settings
Turn on RCS chats or Chat features
Verify your phone number if prompted
Make sure your carrier supports RCS
Make sure your phone is connected to mobile data or Wi-Fi
Update the Messages app to the latest version
Update your phone’s software if needed
Restart your phone if RCS does not activate
Check that your default messaging app is set to Messages
Wait for activation to complete if it takes time