Click on the account page.

Listed there is your account number, a button to logout ( I need to remove that ) and your current "callback" number. The main function of this application is to connect a dialed or selected phone number with that callback number via grandcentral.

If you want the NIT to "ring" search for a thread on setting up gizmo ( both in general and with grandcentral ). The theory of operation here is that your Nokia is signed into gizmo, grandceltral's callback number is gizmo and therefore all the numbers you call will activate the internet call application.

I know that was a little much for one post, so please post a followup if you have questions.