The "4G" in that plan is actually HSPA+, right? Not LTE...?
I found some info on Wikipedia about T-Mobile's frequencies, but it's all very confusing to me. I'm currently on MetroPCS' $40 unlimited plan, but I only get EDGE! :-( I'm considering the aforementioned $70 4G plan on T-Mobile, but I'm not sure my Lumia 625 will benefit from the switch. Would I get anything better than EDGE if I switched?