How will this all work with the different frequecies etc? The AT&T signal is much stronger where I'm at, but about 2X the price of the TMobile laptop connect service....Probably havent crossed that bridge yet? Would love to get "grandfathered" in and be able to access the AT&T signal as the download speeds for the TMobile are are 35 kbps....yeah, that slow. Coverage maps shows that I'm in a good 3G signal area for AT&T.