Rebtel is a powerful voip service provider and it has been providing voip services for many years. In order to let users get to know their products, they offer a free call for trial. You just need to sign up an account, and you could make a free call.
How to use it?
1\ First log into Rebtel. Then enter the phone number of a good friend or family member who lives abroad
2\ Rebtel will instantly provide you with a permanent alias number for your contact.
Save it in your phone.
3\ Call with your mobile or landline – just like before, only cheaper.
Of course you need an account, just get it from here: https://www.rebtel.com/en/Utility-Pages/Join-flow/Join/
By the way, the rates to some destinations is cheap. If you want to buy it ,you could check the rates first from here: http://www.rebtel.com/en/Rates/Rates/
Please share www.getfreecall.org with your best friends. Because this is a really cool website about free calls from pc to mobile in usa,epecaially you could enjoy somefree calls to china,to india from us,By the way, google voice free is a goood choice.