My iPhone 5 will only send pictures to iMessage people not texting?

I just got iPhone 5 for tmobile today and I can send pictures through iMessage but not through texting. Why is that? Is there a way to change it? I didn't see anything in settings about it… Help?

I have about 4 friends going through this issue. I was going to ask if you had tmoible before reading the additional details. I guess its just an issue with many tmobile users. My friends called in to tmobile/ took their phones in and the problem was solved. I suggest you call them

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