T-Mobile Internet and MMS APN Settings for iPhone 4
You can edit your APN information in your iPhone only if it is permitted by your carrier.
Goto Settings > General > Network > Cellular Data Network
Enter APN: epc.tmobile.com
Username:
Password:
Done. These settings are saved automatically.
Goto Settings > General > Network > Cellular Data Network
MMS Settings
APN: epc.tmobile.com
Username:
Password:
MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
MMS Proxy: :
MMS Max Message Size:
MMS UA Prof URL:
Also don’t forget to turn MMS on: