It was first released in 2009 and intended only for use by the company's friends and family, and made only available for Android and Blackberry devices. However, with the release of version 2.0 in 2010, it was opened to the public, and became available for iPhone and other mobile phone users.
WhatsApp Messenger is a cross-platform messaging application for smartphones running Android, BlackBerry OS, iOS, Windows Phone, and Nokia S40. WhatsApp Messenger is a free, cross-platform, instant messaging application with voice and video calling, available for download from the Apple App Store, Google Play Store, and Windows Phone Store. It is provided by WhatsApp Inc., and was developed by two former Yahoo engineers, Jan Koum and Brian Acton. It can be used with any mobile phone number, including those from a different carrier.
WhatsApp Messenger's design is simple and easy to use. It has a blue ribbon at the top of the screen with "New Messages" written on it, and a green ribbon for unread messages. There is also a search function, and the ability to share your location with a friend.
Information about usability
WhatsApp Messenger is very easy to use. The blue and green ribbons are particularly helpful in distinguishing between unread and read messages.
WhatsApp Messenger is a simple and easy-to-use app that allows you to send messages and make voice calls to others who have the app installed on their phone.