iphone 4 with tmobile cannot receive mms

I have a factory unlocked iphone 4 on tmobile, i was unable to recieve mms, but then I input this:

APN: epc.tmobile.com

mmsc:hhtp://mms.msg.eng.t-mobile.com/mms/wapenc

mms proxy: 216.155.165.50:8080

mms max message size: 1048576

mms ua prof URL: http://apple.com/mms/uaprof.rdf

my picture messaging worked after that but i was unable to send or recieve group messages. I have heard of something people do with ibackupbot, i also understand that tmobile does not officialy carry the iphone and so cannot suport all services but i hope that their might be something i could possibly do. anyways thanks for any advice.