I have a T mobile galaxy s5 that I have unlocked for ATT, everything works but MMS

[sdevans80]

I have searched here and on google with no luck. I unlocked the phone via T-mobile customer service, I set the apn settings for the 4g listed on the AT&T website. After a reboot I was connected to lte. I ran a speed test and hit around 15mbs, which is fast for this rural area. Anyway everything I have tested so far works except mms. I tried to send a photo message and it Never went through. Any idea what I missed.
I am new to unlocking phones but not to rooting. I have already rooted this phone. Just needs some tips on working out the kinks of the unlocked gs5.

 

[sdevans80]

update

I rebooted the phone, and re entered the apn settings manually, rebooted again and problem solved. I didn't see where I made a mistake the first time, but I must have... now time for a real custom recovery since I ditched the att iphone version of the s5.