The service requires users to provide a standard cellular mobile number for registering with the service. WhatsApp's client application runs on mobile devices but is also accessible from desktop computers, as long as the user's mobile device remains connected to the Internet while they use the desktop app. It allows users to send text messages and voice messages, make voice and video calls, and share images, documents, user locations, and other media.
WhatsApp Messenger, or simply WhatsApp, is an American freeware, cross-platform messaging and Voice over IP (VoIP) service owned by Facebook, Inc.
