The V660 is a SIP-based dual-mode handset running the Windows Mobile 5.0 operating system. The highly integrated next-generation handset utilizes the proven GSM/Wi-Fi dual-mode voice technology, and takes advantage of the versatile Windows operating system for mobile devices to further expand its usability and functionality. The small form factor makes the handset easy to carry and allows users to place VoIP phone calls in public IEEE 802.11-based environments.With the built-in 1.3-megapixel camera, MP3/MP4 player and camcorder/recorder functionalities on a Windows Mobile platform, users can access the Internet, listen to music, as well as take and review pictures all with one compact handset that also serves as a mobile phone.