Since the N900 can't act as a bluetooth client for tethering, I wonder if anyone has had success with a data only / tablet sim service for it. I've read it could work if you activate a sim in a tablet and then switch to a phone. I use T-Mobile and am thinking about trying it out. But if there's a data-only service in the U.S. that could work I'd like to hear about it. Especially if it's contract free.