I can send MMS to other iPhone users, but not to my other contacts.The Picture will send and stop at 95% and say it was not delivered in the end.
I tried this:
Went to settings then general then cellular then tuned enable 3G off and then clicked cellular data network.
For cellular Data APN: epc.tmobile.com
username and password <blank>
For MMS:
APN: epc.tmobile.com
username and passoword: <blank>
MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
MMS Proxy: <blank>
MMS Max Message Size: <blank>
MMS UA Prof URL: http://www.apple.com/mms/uaprof.rdf
I also tried filling out the cellular data network by entering this information:
For cellular Data APN: epc.tmobile.com
username and password <blank>
For MMS:
APN: epc.tmobile.com
username and passoword: <blank>
MMSC: http://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://www.apple.com/mms/uaprof.rdf