AT&T Data Throttling topic

Hey there! I've lurked here since the days of the HTC Incredible Verizon-CMDA. It's been a few years since then and haven't found any reason to actually start a thread until now. Last phone I had was an iPhone 4S and pretty much got sick of it and wanted something new for a change so I picked up a Lumia 635. I know they aren't that great or really anything special, but they are the newest 4G LTE phones that are budget priced so I figured what the heck, spend on it and if I don't like it, I wont be out of too much money.

So anyways, I am on the AT&T GoPhone plan and I was wondering if there was a way within WP8 to change the APN to something on AT&T that wouldnt be throttled down to 128kbps once I go over my limit. There IS the regular SIM APN settings but when you scroll to the bottom of settings and hit "network" you can see that clearly the phone's APN cannot be switched, thus rendering any of the current ways of changing the APN (for example on Android) to something different that removes your phone from the regular throttled network.

I have been researching and from what I can tell so far, there is no possible way to do so, but I know there are some extremely intelligent people here, maybe someone has been able to figure it out :)

Thanks!