Can't send MMS on Straight Talk on my iphone 4S

I recently switched from AT&T to straight talk because i can no longer afford their packages. Straight talk is much cheaper but my only problem is it won't let me send pictures or anything through text messages. I heard i can adjust stuff to make it work but i don't know.

Is your iPhone unlocked or jailbroken? If not it won't get data on Straight Talk

I have the same issue but mine is unlocked and it just has an e up at the top and jumps back to at&t when i'm not in Wi-Fi

I can send some text messages but not others. Anyone have any ideas? I'm using an Iphone 4s. Everything else seems to be working.

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