Top free Apps like Ringo: International Calling for Android
Make cheap international calls to mobiles and landlines
Ringo: International Calling is a communication app that offers low rates for calls abroad, whether to a landline or mobile.
It works on a credit system so that you can charge up depending on your how much you use. No monthly subscription or registration is required to use the service.
Ringo: International Calling does not need an internet connection and the good news is, your friends don't need to install it for you to contact them.