Not receiving group texts on iPhone 6?

There's one person in the group chat without an iPhone and everyone else seems to get all the messages just fine. Everyone else in the chat has an iPhone with the exception of that one other person. IIm not getting any texts from any of them? I upgraded to the new iOS 9.3 to see if it solved the problem. I turned off and on my iMessage lots of times and restarted my phone. Any tips?

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