How to add contact to already existing text chain
How do I add another person to an already existing text chain? The directions I read on line aren’t working. I don’t get an add contact option.
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If one or more users in your text chain do not use iMessages, but normal "green" SMS messages, then it is neither possible to add nor remove members of the group message.
You can read more about Group Messages in iOS here:
Add and remove people in group text messages on your iPhone or iPad - Apple Support