I thought, that other than approved plans & phones, they didn't allow tethering (I thought the T-Mobile "card" was the only one that allowed tethering for like $49.99/mo). Anyway; if you don't get a vendor-phone (any carrier's mangled OS), tethering was a snap. Regardless; the EDGE speeds are starting to feel creaky. I've been hoping 3G deployment will be more solid in NYC, and that I can buy a HTC independently ....