The Tango service is an amazing cross platform video service that is available for a variety of operating systems. The amazing folks at xda devs have made a XAP file for the Chevron unlocked devices that would allow both front facing and non-front facing camera windows phone to do video chat. Right now, among the HTC devices, HD7, HD2, Mozart, Titan and Radar are supported.
Both Titan and Radar have front facing cameras but the developer has been able to make it work only under Radar only. That said, Titan users have been able to use the back camera for video calling just fine. Here are the versions:
- Without front camera: link (registration on xda required to download)
- With front camera: link
PS: Titan users should install the ‘without front camera’ version