Viber is a communication application developed by Viber Media. Users installing Viber on their Android device can create a Viber account that lets them make free phone and video calls along with free text messaging to anyone else that has Viber. The chatting is known for being very robust as it lets you inset videos, emoticons, stickers, and much more to make any conversation pop out. This feature set is useful not only for those that can only use a Wi-Fi connection but for those on mobile data that don't want to spend too much on their monthly plan.
In addition to being able to talk with Viber users across other Android devices, you'll be able to talk to any Viber user utilizing the client on their Windows, Mac, or iOS device. Any conversation you have is automatically synced across all of your devices so you can always continue what you're talking about no matter what device you switch to.
Overall, Viber is a fantastic option if you're not a fan of some communication applications like Skype or Messenger. The only roadblock you may run into is convincing your family and friends that they should switch over to Viber for their communication application.