Apple iPhone 8
Set up your phone for iMessaging
You can send iMessages to phone numbers or email addresses if the recipient has a device which supports iMessage. To set up your phone for iMessaging, you need to activate your Apple ID.
Press Settings.
Press Messages.
Press the indicator next to "iMessage" to turn on the function.
Press the indicator next to "Send as SMS" to turn the function on or off.
Press the Home key to return to the home screen.
1. 1. Find "Messages"
2. 2. Turn on iMessage
3. 3. Turn text message alternative on or off
4. 4. Return to the home screen