At the initial stage mobiles were used only for communication purposes, but later they were improved to provide some applications like games calculator. Further on they were enhanced to support internet (browsing) and many applications which are implemented using internet. Mobile phone along with calling purposes they also used for sending the text messages which is a easier and trustful way of sending messages. SMS is also cheap when compared to calling charges, the below graph shows the SMS usage worldwide from January 2000 to may 2002. Even SMS have played an role among young customers to buy mobiles and so increase in mobile usage.