I am currently having problems with using MMS on my iPhone. (Unlocked/Jailbroken with Blacksn0w/Blackra1n) At first I simply put in the MMS settings for the Cellular Data Network. I was able to successfully SEND, but not receive images. My second try I used Cydia to install a Legacy Post Paid/Flex Pay Package and put in the MMS settings. I was able to receive but not send. Also this setting also works for Data, which I do not have a plan for so will data be charged? Anyway I am looking for a way to both send and receive MMS on the iPhone using T-Mobile.