Add Contacts to existing text group
I have tried adding more contacts to an already existing group text. I can add the people, but the Done button stays gray and will not let me continue.
iPhone 6, iOS 12
Question marked as
If anyone in the group does not have an iPhone and/or is using SMS/MMS rather than iMessage the group cannot be modified after it is created. This is a limitation of the SMS protocol, which Apple does not control.