Hey guys.. So I've got a iPhone 6s that just randomly stopped sending messages in any group text. It just says message send failure and "not delivered" under the actual text. Yes, group messaging is enabled, send as SMS when iMessage isn't available is enabled, and MMS messaging is enabled. And it randomly stopped. It had always worked before, I didn't change anything. I've tried resetting network settings, turning it off and on, deleting the group message and trying again, and nothing seems to fix it.