While many have confirmed the Sprint Treo 650 had Bluetooth disabled for tethering an internet connection, it appears Sprint now wants to fix that, and has gone on-record stating you will be able to tether via Bluetooth on the PPC-6600/PPC-6601.
According to Jeff Shafter from Sprint Business Solutions PR, an update to the Treo 650 will be released to re-enable this hindered feature. Further, he stated that at the present time, there is “…no restriction on these devices (uses) from a pricing/plan standpoint…”