How to activate MMS/Data with Straight Talk sim in iPhone 4S?

Alright so I have an iPhone 4S which I unlocked because I can use the sim for texting and phone calls but I can't use MMS/Data. Also before you go into the whole sim switch and att.mvno. I can already access the APN settings so I have no need for the sim swap. Also, I've tried SEVERAL of the methods including att.mvno and it didn't work. So first question, is there anyone besides me who can't get any method to work. Two, how did you get you're MMS/DATA to work?

I unlock phones as a side business and this is exactly what I use. It works every time and make sure to reboot your iPhone after. You don't need to change sim cards, just put this into your APN settings. It's worked for hundreds of phones

Name: ST (or whatever you want)
APN: att.mvno
Proxy: proxy.mvno.tracfone.com
Port: 80
Username: Not set
Password: Not set
Server: Not set
MMSC: http: mmsc.cingular.com (**no spaces and no"//"**)
MMSC proxy: 66.209.11.33
MMS port: 80
MCC: 310
MNC: 410
Authentication Type: Not set
APN type: default, supl, mms
APN protocol: IPv4
Bearer: Not specified