Hello guys, please i will like to know if anyone knows of any android app that can be used for calling mobile phones or landlines, it should be able to work in the same way as making regular phone calls, which means the receiver of the calls doesn't need to be connected to the internet. The call rates should also be cheap for calling African countries as well as other phone numbers. I use TALKU APP, but its not been easy buying call credits for the app, i only use the free credits that come with the app. Thanks in anticipation of your help.