Install the same application multiple times

I just got my Google Voice invites (yay!). I have three gmail accounts which received three invitations. Anyways, I have set up three different numbers and would like to use the GV Mobile application for all three numbers without having to sign in and out everytime I want to call a different number. Is there any way to install the application three times on the iPhone, with three different sets of data, so that I can just click on one of the buttons to pull up the control for each of the numbers?

Thanks!