Straight talk AT&T iPhone 4S mms?

I don't want to unlock my IPhone 4S. I have a sim installed for Straight Talk but my MMS messaging doesn't work. I read you need to buy a Tmobile sim to trick it to show my cellular data -APN- specifically. Any way I can fix my mms with out unlocking it?

Apn unlockr and install the att mvno profile

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