I'm on my second T-Mobile Blackberry (Bold 9700) that has this capability, and they work great for WiFi calling. I work out of my basement, and there weren't a lot of options for cell reception. I don't subscribe to their WiFi calling, which means calls use my minutes, but they have a $10/mo plan for unlimited calls over WiFi.

We use ImageMagick behind the scenes on our website to combine images of letters of the alphabet into name prints that are appropriately sized for printing. It's an incredible tool for that purpose.