Mobile phone is an electronic device which is used for telecommunication. It is also used for entertainment like listening to songs, watching videos, internet and other related activities. A mobile phone is made up of different components like CPU, battery, an input mechanism like keypad for feature phones and touch screens for most smartphones, display, speakers, SIM cards and R-UIM cards. A CPU is the processor of phones. A battery provides the power source for the phone functions. An input mechanism, like keypad for feature phones and touch screens for most smartphones, allows the user to interact with the phone. A display shows the user's typing, text messages, contacts, and more.