Fixing T-Mobile Messaging on Unlocked iPhone 3GS/4/4s

Since unlocking my phone I had a lot of problems with my group messaging. It turns out that there are specific settings that need to be put into your Cellular information in order to get your messaging to work correctly. T-Mobile’s customer service was a big help and passed this information along to me (the following is courtesy T-Mobile). This worked for the newest iOS, 6.1, as well as for older versions.

To setup T-Mobile Internet and picture messaging on your iPhone, follow these steps:

  1. If you have access to Wi-Fi, start with Setup guide: Apple® iPhone®.
  2. From the main menu, tap Settings.
  3. Tap General.
  4. Tap Network.
    • Note: For iOS6, tap on Cellular.
  5. Verify the following settings:
    • Data Roaming: On
    • Wi-Fi: Off
    • 3G Enable: On
      • Note: The Apple® iPhone® is missing the WCDMA 1700/2100 band, and cannot function on the T-Mobile 3G network until the network reallocation has been completed. See: T-Mobile Steps Up “Bring your own iPhone” Efforts.
      • Note: Changing the 3G Enable function while the device is on an active call may cause the call to disconnect.
  6. Tap Cellular Data Network.
  7. Configure the internet settings under the Cellular Data section:
    • APN:
      • Note: For some iPhone unlocks you may need to use
    • Username: <Leave Blank>
    • Password: <Leave Blank>
  8. Configure the picture message settings under the MMS section:
  9. Enter the following information under the Internet Tethering section:
    • APN:
    • Username: <Leave Blank>
    • Password: <Leave Blank>
  10. Press the Home button to save the APN and exit to the main screen.
  11. Verify MMS is enabled:
    1. Tap Settings.
    2. Tap Messages.
    3. Set MMS Messaging to On.
      • For iOS5 and lower, Tap MMS first.
  12. Turn the device off and back on.
  13. Test the connection by opening the Safari web browser and sending a picture message.

Posted on February 25, 2013, in Apple, iphone and tagged , , . Bookmark the permalink. Leave a comment.

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