I have been enjoying tethering with my Sprint Centro as host for my N810. The Centro needs a software program called USBMODEM to support tethering, but it works very well. The Centro battery life sucks, so I carry an extra one, which doesn't cost much. Unfortunately, the plan I use, which costs $30 a month for practically everythng unlimited, is no longer available. Sprint doesn't support tethering without a costly fee, but I am pretty sure there is no way they can tell I am using the N810 to do the same things but better than the phone can do.