How to Get a US incoming number for Google Voice

If you are an internet user outside US and want to save some money for your friends who want to call from US, here is how you can obtain a free US incoming number
1, Go to Callcentric.com , Create a user profile under Callcentric You can create profile from any where in the world. Once you create your account you will get confirmation from Callcentric with your Accout information
2, Second thing is Go to http://www.ipkall.com/ Sign up there and provide details u got from Callcentric. After successfully creation of account you can get US incoming number
3, Open www.google.com/voice/  enter your US incoming number and verify as per the instruction of Google