Truphone offers mobile VoIP service that allows calls over WiFi or data networks from Nokia phones, iPhones, and iPod Touches, but notably does not support Windows Mobile phones. The service allows WiFi or data calling on select mobile devices, but is not compatible with all platforms, missing support for Windows Mobile smartphones. Truphone provides a mobile VoIP service that works on some phones like Nokia, iPhone, and iPod Touch, but lacks compatibility with Windows Mobile devices.

1. Mobile VoIP Service(1) Truphone