How To Add A Number To A Group Text On Iphone 11. You can also change the type of phone associated with the number by tapping home to the left of the phone field and then tapping an option (e.g., mobile). From the home screen, tap messages 2.
Select the group text message to which you want to add someone. Select the conversation you want to add an individual to and tap to open it. Go to settings > messages and turn on mms messaging.