During my few months on an ST AT&T LTE sim, I could only use the tfdata APN and not the older att.mvno (or whatever it is exactly) APN. I never used 2.5 GB/month, so I don't have experience with throttling, but I did have a heck of a bad time with delayed push notifications and slow data (constant disconnects to Google's servers, even though no signal loss). I have since switched to a ST T-Mobile sim and push notifications are instant again and internet seems much more responsive. I'm not sure if others have the same issues with the AT&T tfdata APN, but if you do, and T-Mobile has decent reception in your area, I recommend trying the ST T-Mobile sim.
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My wife bought iphone 5 at walmart for straight talk she was paying 45$ plan then she decided to do the 3 month plan and had unthrotteled data she tried the 45$ plan agan and got throttled like normal. She went back to 3 month plan and is now throtteled like on the 45$ plan.
No matter how many service periods you purchase at once, each thirty day service card is applied one at a time each thirty days.
Earl F. Parrish