Straight Talk has created a new service so existing customers can make International calls at a great rate. Link: Current price table
You can register an unlimited amount of cell numbers that are able to access this feature, even phones that are not Straight Talk (How ever to this page you need to be a customer already).
|Once you have registered your phones and topped up the Straight Talk International account, you can dial 1-855-STR8-TLK (855-787-8855) and from Puerto Rico, USVI, Hawaii and Alaska dial 305-424-5811 and just follow the prompts to connect to your predefined contact.|
The service quality is good, it does use VoIP that's how the rates are so competitive.