As additional info, it makes no difference who I include in the group... if there are more than one sender or receiver it doesn't work. Not trying to send pictures. And, group messaging is turned on. I've turned it off and reset, turned the phone off and back on, even removed and reinstalled the battery with no results.
I would be concerned too if I were unable to send group messages. What messaging app are you using on your phone? Does your phone show a 4G/LTE connection? Are you able to send picture messages?
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