Turn Your Smartphone into a Webcam with SmartCam

Windows only: Free, open source application SmartCam turns your Symbian Series 60 smartphone into a wireless Bluetooth webcam. Just install the program in Windows (works in XP and Vista) and install the client to your smartphone (be sure to follow the readme in the \win\installer directory). When it's all set up, your SmartCam works with Skype and most other video chat services, meaning that if your computer doesn't have a webcam but you've got Bluetooth and a Symbian smartphone, you're in luck. SmartCam is a free download, Windows only.

SmartCam

Source