AT&T MMS APN Settings

I discovered today that I was not able to receive any MMS messages on my new Microsoft Lumia 950. Both picture messages and group messages were showing up in the Messaging app as “Media content in this message” with a download button. Pressing the download button did nothing, and some internet sluthing led me to check my MMS APN settings on my phone, which I assumed had been set up already by AT&T – turns out, I was wrong.

The following settings worked for me, and immediately after applying these settings, messages I had received started grouping themselves together and downloading.

  • APN: Phone
  • User name: -blank-
  • Password: -blank-
  • Type of sign-in info: PAP
  • IP type: IPv4v6
  • Proxy server: proxy.mobile.att.net
  • Proxy port: 80
  • MMSC (URL): http://mmsc.mobile.att.net
  • MMSC port: -blank-
  • Maximum MMS size (KB): -blank-

I entered the settings in the MMS APN section of Settings in Windows Phone.

To get there: Settings -> Network & Wireless -> Cellular & SIM -> SIM Settings -> Add an MMS APN