REQ: apk for stock messaging app supporting Group Messaging

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http://forum.xda-developers.com – I tried Jelly Belly to see if the group messaging worked, but no dice. I can send to a group of iphone users but when I receive the messages they just come in the individual threads. Is group messaging working / figured out yet? If so, is there an apk floating around to download? Thanks! (HowTos)