Hi, Tellme is currently available on the BlackBerry 8100, 8800, 8820, and 8310 on AT&T, 8830 on Sprint, and we'll be adding support for the 8830 on Verizon on May 7th. All supported phones are listed here:
Tellme | Say it. Get It..
We're working to add support for more phones and carriers, and if your phone isn't one of these you can sign up for notification when when your phone becomes supported from this page:
Tellme | Say it. Get It.