Can't get group messages from iphone user

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I use to be able to get group messages from an iPhone user when I was using my Razr Maxx but switched to an iPhone for a couple months, then back to the Razr Maxx and now I can't get group messages from my iPhone users. I'm using the same text message service I was using before trying an iPhone so I don't know why I now can't get group messages.
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http://support.apple.com/kb/TS5185