said by NOVA_Guy:I think that Google Voice also has apps for Windows Mobile phones and Blackberries. I know there are at least one or two available for the Palm Pre as well. The iPhone may be the most popular device that has the ability to use Google Voice, but it's far from the only one out there. There are plenty of choices.
I have GV on my Blackberry and I mainly use it to make long distance calls and texts to friends in other countries as GV has excellent LD rates, Canada is unlimited free too. Plus Verizon charges 25 cents per text to out of country. So to me I see it as a calling card I guess, as I have used those before too.