We have all been used to hearing this word as a form of being able to work or communicate from anywhere. It is most especially connected towards the area of technology where notebooks, laptops and cellular phones are the easiest to be categorized in.

The mobile phone or cell phone is a long-range, portable electronic device used for mobile communication. In addition to the standard voice function of a telephone, current mobile phones can support many additional services such as SMS for text messaging, email, packet switching for access to the Internet, and MMS for sending and receiving photos and video. Most current mobile phones connect to a cellular network of base stations (cell sites), which is in turn interconnected to the public switched telephone network (PSTN) (the exception is satellite phones).

(from Wikipedia)