Apple iPhone 3 / 4 / 4S / 5 Picture Messaging MMS Setting for T-Mobile

Settings for T-Mobile Internet and picture messaging:


From the main menu, tap Settings.
Tap General.
Tap Network.
Verify the following settings:
Data Roaming: On
Wi-Fi: Off
3G Enable: Off 
Note: The Apple® iPhone® is missing the WCDMA 1700/2100 band, and cannot function on the T-Mobile 3G network.
Note: Changing the 3G Enable function while the device is on an active call may cause the call to disconnect.
Tap Cellular Data Network.
Configure as follows:
APN:  epc.tmobile.com
Note: For some iPhone unlocks you may need to use wap.voicestream.com.
Username: <Leave Blank>
Password: <Leave Blank>
Enter the following information under the MMS section:
APN:  epc.tmobile.com
Username: <Leave Blank>
Password: <Leave Blank>
MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc 
MMS Proxy: 216.155.165.50:8080  (Leave Blank for 4S)
MMS Max Message Size: 1048576  (Leave Blank for 4S)
MMS UA Prof URL: http://www.apple.com/mms/uaprof.rdf
Press the Home button to save the APN and exit to the main screen.
Turn the device off and back on.
Test the connection by opening the Safari web browser and sending a picture message.


Verify MMS is enabled:

Tap Settings.
Tap Messages.
Tap MMS.
Set MMS Messaging to On.