Whatapp is definately the best android app that I have been using since four and half years. It has changed the trends of messaging. It is free and easy to use. Earlier we used to spend a lots of money on message packs. This was almost stopped when whatsapp came into existence. There are many other messaging apps but watsapp is still the best. It has improved a lot over the years. Voice message and free calling is the most sucessfull development of whatsapp. Whatsapp calling works really well. I love whatsapp because of its lovely features and never felt any need to install other messaging apps. Also almost all my friends use this app so it helps me to be in touch with them. I don’t need to send them request as they also love whatapp. Best android app ever.