The King of Instant Mobile Messaging. Whatsapp had its busiest day yet with 18 billion messages being send over its network on December 31 2012.
On Dec 31st we had a new record day: 7B msgs inbound, 11B msgs outbound = 18 billion total messages processed in one day! Happy 2013!!!
— WhatsApp Inc. (@WhatsApp) January 2, 2013
WhatApp charges IOS users 99 cents per year. Android, Windows Phone and Blackberry users get the first year free and then are charged 99 cents per year thereafter. What makes WhatsApp very enticing is the fact it is cross platform. It has become the most popular paid app in many iTunes country stores and is winning against the mainstay BBM from Blackberry.
This means iMessage and Facebook Messenger have some interesting competition. Carriers on the other hand are seeing one of their most profitable services (SMS) vanish into thin air..