i just bought a t mobile hot spot device from walmart. the one that cost 115 dollars and i also bought a 3.5 gigs 2 months prefill card and i just use it for my ps3 to play modern warfare 3 online. after 1 hour, i check and use 380 MB? and i also had to update my game which cost abot 130 MB is this right? i mean like wow it seems to be i just got ripped off.