APN: epc.t-mobile.com, fast.t-mobile.com
Proxy: <Leave in Blank>
Port: <Leave in Blank>
Username: <Leave in Blank>
Password: <Leave in Blank>
Server: <Leave in Blank>
MMSC: http :// mms.msg.eng.t-mobile. com/mms/wapenc
MMS proxy: <Leave in Blank>
MMS port: <Leave in Blank>
Authentication type: <Leave in Blank>
APN type: default,supl,mms
APN Protocol: IPv4/IPv6
APN Roaming Protocol: IPv4/IPv6
I posted this over at AC too. I had the issue of not being able to receive MMS with wifi on with any messenger except Hangouts and the stock Messaging app. I found out that I had to create a new APN but that only worked on LTE. These settings will work for LTE or HSPA/3G. It will allow the messaging app to automatically turn on mobile data and download the message. Not sure if it'll mess with wifi calling since I don't use it so YMMV. Since this is a new account the MMSC url had to be broken to post this so adjust as needed.
Last edited by Jayslaw; 23rd April 2014 at 12:58 PM.
Reason: to better explain issue in title