The downloadable application is intended for smartphones running the PPC2003, Windows Mobile 5, and Windows Mobile 6 operating systems. Raketu provides a Skype-like service that enables VoIP calls from computers and mobile devices.

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The company has "free calling zones" in more than 40 countries where users can make free international phone calls. Users can purchase a $9.95, $24.95, or $49.95 package to prepay for minutes not included in the free zones, according to Raketu. In locations not covered by the free zones, Raketu charges a cheap calling rate, which varies by country.

The application also can be used to send text messages globally at low international rates and to send e-mail and instant messages.

Raketu said its Windows Mobile customers will get the same benefits as its "RakOut" computer-to-phone prepaid customers, who receive 1,200 free minutes each month when they dial from their PC to a landline or mobile phone.

Earlier this month, Raketu introduced a VoIP application for BlackBerry users. The BlackBerry application is Web-based app, so it doesn't require downloading or installing software on a smartphone, whereas the Windows Mobile app does. To use Raketu's service on a BlackBerry, users must point their Web browsers at BlackBerry.raketu.com.

Raketu isn't the only VoIP provider targeting smartphone users. IVR Technologies, a software developer specializing in IP services, also this month unveiled new applications for making affordable calls on Windows Mobile 6-based smartphones. The applications -- Smartphone Calling Card and Callback -- are add-on modules for Talking SIP, IVR's application, media, and billing server. They can be integrated into Windows Mobile smartphones to facilitate cheaper mobile long distance rates.