t mobile mda and media net
 

hey guys i have a just my brothers t-mobile mda and i need it to access cingulars media net.....i have the phone unlocked and i matched the connection settings with my 8125 and for some reason i still cant access media net or send mms.....is there a reg tweak i need to do?? or am i doing something wrong?? i need some help on this one.