Put this post in hot deals because it requires a client download (also free) and listening to a 15 seconds ad when you make call (You hear the ad before making the call, the one you call doesn't hear it and when people call you neither hear an ad)
Why Pay to Keep in Touch?
Call anyone in the US* from anywhere in the world absolutely FREE. Make the switch to Whistle today.
*Excluding Hawaii and Alaska
Whistle - Free Phone Calls to Anyone in the U.S.
1. Download Whistle
https://whistlephone.com/whistles
2. Run Whistle installer
3. Open Whistle
4. Select "Create Account" from setup wizard
5. Fill out the Create Whistle Account form and then click "Sign Up" button
6. An activation email will be sent to your account email
7. Click the activation link in the email to activate your Whistle account
8. Start enjoying your Whistle Service
Call anyone in the US* from anywhere in the world absolutely FREE 
