After the dawn of Yahoo Messenger Chat Room, the new era of Chatting and Instant Messaging change to Mobile Messenger. One of the most popular client at this time (by 2013) is Whatsapp Mobile Messenger. What make this Mobile IM Client so popular is its ability to synchronize the mobile number as its username and all the contacts will be added automatically as Whatsapp’s friendslist. No need to create new username, no need to register: just need to enter the nickname or avatar (optional). Right now, Whatsapp claimed on having more than 100 million user.