Google Voice not yet open for users outside the US

Google Voice is not yet open for users outside the US, but are planning to expand our service to additional countries in the future.

However if you are in the US you can now port you existing mobile number to google:

• googlevoiceblog.blogspot.com/port-your-existing-mobile-number-to.html
• google.com/support/voice/bin/answer.py?hl=en&answer=1065667