VoIP software developer Jajah has come out with new services for Windows Mobile, BlackBerry and Symbian handsets that let consumers make VoIP calls from their mobile phones, either over Wi-Fi or a carrier’s network.

Jajah offers the services as a white-label solution, so carriers and other service providers can launch the applications under their own brands.

The BlackBerry app, available as an over-the-air download, via the desktop manager or from a corporate BES server, adds "JAJAH Call" to the device's phonebook menu. The Symbian app lets users with S60 phones choose whether to route their international calls over the Jajah IP network or the standard cellular network. The Windows Mobile app is a full SIP-over-HSDPA/Wi-Fi mobile VoIP solution that turns any device into a full-function VoIP phone.

Jajah is the same company that recently launched an application that turns an iPod touch into a mobile phone.