General group chat help

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http://androidforums.com – hey guys, I am trying to setup group chat/mms so i can chat with my friends who have iphones and htc. I read that handcent and gosms pro can do this. However, when i send an outgoing message it send in a group, but their replies come back in the seperate individual user threads. i have the option checked for group mms, but its still not working. Please help! Thanks (General)