In these days, mobile phones are one of the most essential devices. It is also known as cellular phone, cell phone and a hand phone. It is used to make and receive telephone calls through radio link. The cell phone network is provided by a mobile phone operator. The modern mobile phones are used for many purposes such as sending text messages, email, MMS, short range wireless communications like infrared, Bluetooth, internet access, business applications, gaming and photography. The mobile phone has general computing capabilities. It is also referred to as smart phones. The first cellular phone device was implemented by Dr. Martin Cooper of Motorola in 1973. The mobile phones provide many features. It is made with an innovative technology. The battery is the power source of the phone functions. It is also used for sending text messaging. It is simply known as SMS. SIM card is another essential part of mobile phones.