Differences between your phones and desktop computers

Last week, I read some technical papers related to my question and got some interesting points of view from the academic world --- From researchers' points of view, the two fundamentally different aspects (and hence challenges) of mobile devices compared with traditional stationary computers are *wireless* and *mobility*.

The term wireless infers that wireless devices such as your phones and laptops use different protocols and methods to transmit and receive data to and from routers or access points. For example, your phones may use the GSM protocol to make calls and Wifi to access Internet. These protocols and are different from those used previously in stationary computers which are connected though using physical cables.

The term mobility infers that the wireless devices need to keep the connections to other devices alive while the users (and the devices) are moving. For example, wireless devices must prevent any disturbance to your phone calls and web surfing experiences from any disturbing, no matter are that the user is walking, driving, or taking the train which is moving in an at a speed of 250kmps kph [kilometer per hour].