so i just updated my lovely htc hd7 windows phone and it now comes with an "internet sharing" option which is tethering for *free* and its totally legit! anywho, the 3g is pretty fast, sometimes even faster than my home dsl which is awesome! however, i know tmobile has a 2gb data cap, does this apply only to 4g speeds or the 3g as well? the htc hd7 isnt 4g capable only 2g and 3g so im wondering if i can basically use my 3g like no ones business or will the cap still affect it?

thanks!!