Truphone, the VoIP-calls over mobile software developer made most famous by its iPhone app, now has a beta version of the app running on the BlackBerry 8801 and Curve devices. The product is called Truphone Anywhere for Blackberry.

London-based Truphone, which can use Wi-Fi as well as phone network for VoIP calls, started out on Symbian OS-based Nokia devices but really started to hit paydirt when it launched an iPhone app. There is no Windows Mobile version right now but one is understood to be in development.

The software can be downloaded via Blackberry’s built-in browser. Truphone integrates well with the handset’s address book and the newer version of the software routes calls via the cheapest network available to the handset, be it GSM or Truphone’s service over VOIP, but only if you select this manually.

Truphone’s targeting of the Blackberry could take it a great deal more mainstream in the US than the iPhone or Nokia devices are capable of, especially among business users looking to cut costs.

Update: You can get the app now from here.