AT&T One and group messaging compatiablitty

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http://forums.androidcentral.com – I would love for someone to answer a couple of simple questions for me... 1st. Will the AT&T ONE in stock form properly group message with multiple iPhone users? 2nd. If the answer to 1 is "no" will the eventual upgrade to 4.2.2 allow this to work with native software? 3rd. If the answer to 2 is "yes", out of curiosity, is it the 4.2.2 JB upgrade that makes it possible, or is it Sense 5.0 that makes it happen. THANKS!!! (HowTos)