Well to tell the truth, he has also not been able to *actually* bypass it - what he though can is receive and make free calls to US from desktop at least for now :)
Have to wait for full service to start here in India.
So from the horses mouth itself, on what he did to work around the restriction of US-only limitation for Google Voice.
- Toughest part: Get an Google Voice Invite first :) from here
- Find a US-based proxy server (or use ultrasurf 9.5 and IE, other browsers wont work) [Mostly not to leave a trail]
- Get a free US incoming number from Gizmo5.com or Sipgate.com using the proxy
- Open Google Voice invitation using proxy and follow instructions
So it took my friend 4 hours to do the above, but he claims that it should take anybody just under an hour as the steps are out there now :)
So give it a try, and do tell if it worked for you.