Mobile cellular phones are hand held devices that permit calls into the public switched telephone system by using a radio link. The earliest mobile phone units were big, bulky and permanently installed in vehicles. In 1973, Dr Martin Cooper of Motorola demonstrated the first use of a hand held mobile phone, which weighed about 2 ½ lbs (approximately 1kg). A decade later Motorola released DynaTAC 800x, which was first mobile phone that was made commercially available. Today, there are more than 4.6 billion mobile phone units being used in the market and these are available everywhere: from developed countries to smaller economies.
Nowadays, modern day mobile phones do not just make and receive telephone calls, they also support a wide variety of communication media such as text messaging, multi-media messaging (MMS), email and internet access, amd short-range wireless communications such as infrared and Bluetooth). Some units even allow users to play games and take pictures. Newer mobile phones, called smartphones, have more functions and offer higher levels of general computing capabilities.
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