S7 from straight talk also having this issue. Tried most of what others have...safe mode and all, still says failed. Unfortunately ST also disables a lot of the advanced options on these phones so I'm pretty limited with what i can change. The Group message does work, but i cant do group messages like that with all my co-workers etc, hopefully this gets fixed quickly. Started happening right after my latest software update which i got 8/14.
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