At last I am able to use DialCentral (just got the GV invite and created my account).

Last night I used it for a few moments and called - was on Wifi.

Today I am on a 3G connection thru my phone and am trying to use DialCentral.
I dont see the Dial button being enabled at all, mt DialCentral number does not show and nothing seems to work.
Is GV limited to Wifi use only and not 3G ?