So I just so happened to finally check to see if MMS worked on my iPhone while using T-Mobile on it and guess what, It works!! I am running iOS 6 beta 1 on an officially unlocked iPhone 4. I added the regular setting to my cellular data section in the setting and now it works! Thank you ! ------ Also I hated the idea of doing that backup hack to fix it. I actually was thinking of switching back to AT&T just because of SMS. Well considering it, I like T-mobile. For some reason in my house only I get little to no service in my house. Whats the point of having a iPhone and you cant even use it to talk on in your own home? Another this is my 3G on T-mobile works too. I get about 3.7mbps down and 1.14 up. When I first connected I got up to 6mbps down but when I checked just now the highest I got was 3.7. Just some info I thought I would spread with the forum. I normally dont post much so thought I'd say something useful when I do. Ohhh just remembered. The last thing I need them to fix is iMessage. I don't like how they need to use a international number to verify my number. So I cant use that new unified message feature that iOs 6 uses. Hopefully they'll change it in the new betas. Basically right now my phone number wont tie to the iMessage account so I have to use my email to even iMessage! Feel free to comment and let me know if this works now for you.