Smart phones are the phones that have the function of the personal digital assistant and the functions of the mobile or camera mobile. The mobile operating systems used in the smart phones are the apple’s ios, Google’s android and Microsoft’s mobile windows.  The screen of the phone is big and that has got the high display resolution that gives the people a better experience when they use them. The smart phones have good multimedia functions in them that are liked by the people. During first this phone came to the market the price of them was high not all people could get them. But recent years many companies started too produce their smart phones, this caused to the price down, the people could get the apple iphone even for $499 that considered being cheap when compared to the early years. Each year the companies try to give their own product that has different one from the earlier and that gives the people more good experience in using them. This upgrading of phones is seen in all companies and the people try to get the new one since they could use the technology better.  The use of phones is increasing among the people so they could get connected very fast.