As we know Voxer is walkie talkie app special for smartphones. There are some people are looking for Voxer for BlackBerry. They don't know what devices that supported by voxer app. I don't know what vendor that supported by voxer.
Based on information that I've got from Voxer Official Site, voxer app compatible with iPhone, iPod touch, and iPad. Requires iOS 4.0 or later, and Android operating system.
For you are looking for voxer app for BlackBerry device, I hope you can be patient to waiting for Voxer for BlackBerry because I have found a statement of the Voxer Support at support.voxer.com. There is someone asked about voxer for BlackBerry and then the Voxer Support said: "We have no plans to implement Voxer on Blackberry at this time" on November-11 2011. It's means Voxer not support BlackBerry at this time. Just be patient to waiting for Voxer for BlackBerry. Next time, maybe Voxer will available for BlackBerry.
source: Voxer Support Site