A tablet personal computer (tablet PC) is a pocket computer equipped with a touch screen for input, and running an OS such as android or iOS. Tablet PC screen size is usually in the range of 7" up to 11". After 11 inches, it usually comes into small size laptop and hardly fit your packet. Lower than 7inches, smart phones are popular. The article describes the components of a tablet PC, advantages and disadvantages, and how it compares with laptop and smart phones.

Satellite phones, as the name implies, uses satellite signals to operate, where as conventional cellular phones use terrestrial signals from cell towers to communicate. Relatively, satellite phones are expensive when compared with other types of phones, however satellite phones have wide geographical foot print and could be used where terrestrial signals are unavailable or not feasible.

The article offers recent developments and the features available on cellular phones. The hardware and software characteristics of the smart phones discussed. Features that are found often in smart phones such as camera, infrared, usb, and wifi connectivity have been discussed. The future trends in the cellular mobile phones and references have been provided.