I'm using the iPhone 5 on T-Mobile, and Group MMS doesn't work. It works fine if everyone uses iMessages, which makes sense, but if I add in anyone without an iPhone, my group message just sends as an individual text from me. For example: I send a group text to Tim, Matt, and Bob. Each of them gets a message from Adam, but the other members aren't included in it. If they reply, I get the reply as a message from Bob, but Tim and Matt don't get it at all. I flat out do not receive group messages that others have started. For example, if Bob creates a group text with Matt, Tim and me, Matt and Tim will get a group text as intended and can reply to each other, but I get nothing. Not an individual text, not a group text: nothing. Does anyone know a) why this would be a problem and b) if there's any non-jailbreak way to fix this or even just an app to work around it?