WhatsApp Messenger is a freeware, cross-platform an end-tae-end encryptit instant messagin application for smartphones. It uises the Internet tae mak vyce caws, ane tae one video caws; send text messages, eemages, GIF, videos, documents, uiser location, audio files, phone contacts an vyce notes tae ither uisers uisin staundart cellular mobile nummers.