Facebook has recently launched new audio calling app called CatchUp. This app will allow users to join a one-on-one audio call or group call with family, friends, classmates, anytime you can talk for free on CatchUp. It will help people to stay in touch with each other in a more efficient and unique manner.
Batter privacy settings
create and join call's with friends, family, and others
automatically update your status when you connect to the network
This app is currently unavailable in a few regions and countries.