Issue with group text/chat using Go SMS Pro

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http://androidforums.com – Hi all, I just downloaded the Go SMS Pro app (GS3 here) to do group chat with my siblings. By group chat I don't mean mass texting, but having a thread where everyone involved can text each other and have it appear in one thread and see who is in the group chat. I like this app over GroupMe because then my siblings with an iPhone don't have to add another app and then go to that app to group chat. So my issue is that when I send a text to a group of people, a "thread" or "group chat box" does develop, but only with people who have androids. The iPhone users just end up (General)