• To set the Access Point Name (APN) and turn on data settings, follow these steps:

  • Go to the Home screen. Choose Settings.

  • Scroll down. Choose Cellular.

  • Choose Cellular Data Options.

  • Choose Cellular Data Network. If Cellular Data Network is not available, manual configuration is not possible. In this case, connect the device to the computer and use iTunes to install the ‘Carrier Settings’.

  • Edit the details for MMS as follows: Under APN, enter epc.tmobile.com Under Username, do not enter anything Under Password, do not enter anything

  • Under MMSC, enter http://mms.msg.eng.t-mobile.com/mms/ Under MMS Proxy, do not enter anything:nothing Under MMS Max Message Size, do not enter anything

  • Choose the arrow symbol.

  • Return to the Home screen. To finish the process and activate the settings, you need to restart the device. Your iPhone X will then be configured to use of MMS. For instructions on how to restart your device follow the next steps.

  • To turn off the iPhone X, press and hold the power button and the volume up button on the side of the iPhone X.

  • Drag the on/off symbol to the right.

  • The iPhone X has been turned off.

  • To turn on the iPhone X, press and hold the power button on the side of the iPhone X.

  • If this screen appears, swipe up from the bottom edge of the screen. If this screen does not appear, go to the next step.

  • If this screen appears, choose Unlock. If this screen does not appear, skip the next steps.

  • Enter the PIN code.

  • Choose OK.

  • The iPhone X is now ready for use.

  • The device is set up for MMS. If you have data coverage, you can send a message to test the connection.

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https://www.t-mobile.com/support/tutorials/device/apple/iphone-x/topic/settings-amp-tech-specs/configure-mms-manually/3

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