Iphone 5 on Tmobile mms problems?

I got the iphone 5 two days ago. I went to Tmobile they put the SIM card in. Everything was working fine until I went to send a picture message. I can text, call, use the internet with and with out Wi-Fi. So I went back to Tmobile. And they said I typed all the APN numbers correct. I also went back to the Apple store. They said the only thing they know to do is to restore the phone. So I did. And I retyped all the APN numbers back in. Tmobile checked it agian. Everything was correct. But My phone still will not send picture messages.

Tmobile suggested I try to exchange my iphone 5 with another iphone5 at Apple. Will Apple do this? Why would one Iphone5 work and another one not work? Is there any other Ideas on how to fix the mms problem?

Here is the APN numbers I had typed in.

Go to Settings, General, Cellular, Cellular Data Network & Input this Info in the necessary slots.

MMS APN: epc.tmobile.com

MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc

MMS Proxy: 216.155.165.50:8080

MMS Max Message Size: 1048546

MMS UA Prof URL: http://www.apple.com/...uaprof.rdf

Now just go to the Messages Tab in Settings, Enable MMS & That's It! You are done, Enjoy the MMS!

Added (1). I also went on to the Tmobile website. And their directions for the APN numbers were the same.

Added (2). I also went on to the Tmobile website. And their directions for the APN numbers were the same.

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