Bluetooth is not a single specification, but a long list of possible "profiles" for various purposes. For the Lumia 800, the listed Bluetooth profiles on http://www.developer.nokia.com/Devic...ons/Lumia_800/ are: A2DP, AVCTP, AVDTP, AVRCP, GAVDP, HFP, HSP, PBAP, RFCOMM, SPP. For, e.g., the Nokia N900 (Maemo 5) the profiles listed on http://www.developer.nokia.com/Devic...ications/N900/ are: A2DP, AVRCP 1.0, FTP, HFP, HSP, OPP E.g., the missing DUN (Dial-Up Networking Profile) means that you can't use the Lumia 800 as a Bluetooth "modem" to a PC. The missing FTP (File Transfer Profile), OPP (Object Push Profile) and GOEP (Generic Object Exchange Profile) means that you can't send files or contacts, calendar events to/from the Lumia 800 over Bluetooth. Here's a list of the various Bluetooth profiles and what they're for: http://en.wikipedia.org/wiki/Bluetooth_profile