From ECDL.web

Mobile computing is a form of human–computer interaction where a computer is expected to be transported during normal usage. Many types of mobile computers have been introduced since the 1990s, including the

• Portable computers,
• Laptops,
• Tablet computers,
• Netbooks,
• PDAs,
• Smartphones,
• E-book readers,
• Calculators and
• Carputers.

[edit] Benefits of mobile computing

• Improved information accessibility: Mobile computing technology provides a wide range of options to access and create information on the move, eg. news reporting and consuming, health care, transportation and shipping, utility inspection and other field work.
• Increased efficiency: Mobile computing enables the computing power and information contained within the fixed information system to be structured around the optimum work flow of a mobile worker. The mobile computer stays with the mobile employee, instead of the employee being required to travel to the computer. Mobile computing can improve efficiency in many ways, by saving time; reducing waste; reducing rework; improving accuracy; and (h) reducing unnecessary travel.
• Improving sales and support: The mobile computer frees the sales or support agent to meet with the client at the client's home, office, or other location. Customer data is collected, estimates and comparisons can be immediately calculated, and data sent back to the central computer.

[edit] Limitations of mobile computing

• Power consumption: When a power outlet or portable generator is not available, mobile computers must rely entirely on battery power. Combined with the compact size of many mobile devices, this often means unusually expensive batteries must be used to obtain the necessary battery life.
• Insufficient bandwidth: Mobile Internet access is generally slower than direct cable connections, using technologies such as GPRS and EDGE, and more recently HSDPA and HSUPA 3G networks. These networks are usually available within range of commercial cell phone towers. Higher speed wireless LANs are inexpensive, but have very limited range.
• Security: When working mobile one is dependent on public networks which transfer information unencrypted, thus allowing eavesdropping.
• Potential health hazards: There are allegations that cell phone signals may cause health problems. Cell phones may interfere with sensitive medical devices. More car accidents are related to drivers who were talking through a mobile device.
• Human interface with device: Screens and keyboards tend to be small, which may make them harder to use. Alternate input methods such as speech or handwriting recognition require training.