IPhone 4, IOS 6.0.1, straight talk service, MMS not working

I bought this phone several months ago and it came with the IOS 6.0.1 update on it. I was unaware the phone's MMS and Data wasn't going to work with that update on Straight Talk.
When I received it I got online and ask how to fix this and someone sent me a link for unlockit or something so I tried to follow the directions to make it work and in the end I got my data to work but didn't realize my MMS wasn't working.
So I have been using iCloud and data to send pictures online but I really want my MMS to work!
Does anyone know how to help me get it started working?
Please respond as quickly as possible.
Also I know that AT&T has a $50.00 per month unlimited phone plan-
Is there any way at all I could format my phone back to it's normal, switch to them, then my data and mms work.
I don't know what jailbreaking is but I have a feeling I don't wanna jailbreak my phone… What is jail breaking?
If anyone knows please let me know and your help will be GREATLY appreciated!

You need to change the apn settings.
also the att $50 unlimited plan doesn't work with smartphones, the data will not work.
email me and I can get you the settings

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