I'm not sure you could hook up a laptop usb 3g modem to a net tablet, even with the host mod, because I'm pretty sure you need drivers for those, especially if you are running linux, maemo of all things, because you know theres no way the drivers are included and they probably don't exist, but I could be wrong. I'm pretty sure that the 770 and 800 talk to the phone through the Bluetooth DUN (Dial Up Networking) profile, so theoretically any cell phone that supports DUN (do a google for the phone model, a place called phonescoop nearly always has these details) could be used to tether to the tablet. Of course theres always the nasty chance that the carrier might disable the DUN profile on the phone if you dont have a 'tethering' plan, or might catch you for violation of the TOS if you dont have the plan but tether anyway and use a suspicious amount of data for a 'normal' cellphone. I'm pretty sure AT&T has a 'normal phone' data plan, a 'pda phone' data plan, and a laptop connect plan. I'm pretty sure one of the later two is required for tethering. What I'm trying to figure out, is that if I buy a laptop connect card from ATT and pay the $60/mo for unlimited data (backstory for this crazy behavior is where I go to college our network is crap and constantly tcp flooded to death by the idiots using bt and not configuring it right, to the point I cant even play a game of starcraft) and then a normal cellphone with 3g, do I get unlimited data on my cell so that I can tether my 770, or do they expect me to buy a seperate plan for the phone since it has a different sim?