Straight talk iphone mms fix

Hi guys I have a friend with an unlocked iPhone for straight talk. His mms stopped working suddenly. Is there a jailbreak tweak to fix this? I'm very familiar with jailbreak but not unlocking. I don't want to mess with deleting the settings and reapplying them. AND I don't have a MySimpleMobile or TMobile SIM card. So jailbreak his phone, then what? It's IPhone 4S. Straightalk on AT&T network.iOS 6.1.3. All thats wrong is his mms.

It sounds like there's an MMS bar applied for whatever reason (over allowance?) call up TMobile customer service and they can check.

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