WM6.5.3 Data settings?

[pizzaboy192]

here's my issue. I've got a Verizon LG Fathom. I've had no issues with any of my settings because I've got the unlimited data pack.
My girlfriend has a LG Fathom, but it is unlocked. She is using it on T-Mobile.
Before she got the Fathom, she had an unlocked AT&T Moto Q9H. It worked on T-Mobile fine, and with a little bit of help from the internet, I was able to get MMS working properly on it. (Remember, the Q9H is running WM 6.1 standard, the Fathom is 6.5.3 Pro)
The problem I am having is that I can add a MMS server in just fine in a GSM version of Arcsoft, but I have no idea how to add the other half (The WAP.Voicestream.com or whatever else I need) to the data part of the phone, allowing the MMS to actually connect to something.
I am completely lost at this point, because there's no way for me to get MMS working, and I can't get the settings off the Q9H because the USB port fell off and will no longer charge.

Sorry for the wall of text, but I'm slowly going insane having to deal with her begging me every day or two to get MMS working on her phone.