Community telecom is offering $1 free trial call to its registered users. You can make the PIN less call from your registered phone. If you are calling from another number, you need to dial the PIN.
Visit http://www.communitytelecom.com/ and then click on "call free".
It takes some time (10-30 minutes) to credit your account with $1.
I tried to register and I could see $1 credited to my account but I couldn't make the trial call because of some technical reasons. I called the customer care but still the problem could not be resolved, You can try this service, I hope it would work for you..
Thanks to Driss from morocco for sharing about communitytelecom.com