I love this app and its a great app and use it from more than 2 years and every time . It has been a very usefil application for messaging. group chat.and also for video and voice calling.at this time everyone use whats app for calling and messaging with relative.friends.and family member.if u don’t have balance in mobile then you can call and contact to anyone with what’s app . Useful and great app .Its quick, simple, looks great and is easy to use.its a best messenger app which I ever seen before