20.2 Mobile Devices

	Mobile devices have been evolving in terms of size, weight, mobility convenience and functionality.
	Below is a list of mobile devices.

		Pager: receives only simple text messages, small display.
		Mobile phone: receives/sends voice, data, text display.
		Smart phone: more advanced capabilities, internet connectivity
		Mobile tablet: based on touch screen user interface.
		Laptop: Full function of a desktop, big display.

One can see how as we go down the list, devices provide more performance and are bigger in size.