Ringo lets you make low cost local and international calls without using the Internet (WiFi or 3G). You can call any mobile or landline phone number anywhere in the world. Now talk to your heart’s content without worrying about phone bills or internet connectivity. Ringo is one of the lowest price app which allow users to spread their words worldwide with your friends and family members. This App is the most efficient calling app doesn’t require internet for calling and your friend too (Data required just to send an request – Call will not consume a single byte while calling).