is a facility on a mobile phone that restricts outgoing or incoming calls, including whether the phone can make and receive international calls.

refers to the geographical area that is covered by a mobile phone network.

means that a lender has registered an interest against an item such as a car when it has been used as security for a loan. The interest is an indication that the lender has taken the car as security for the loan.

is a warranty provided by law. One example is the merchantable quality condition that requires that goods will do the job they are supposed to do. If they don't then the buyer is entitled to return them to the seller to get a refund. Other statutory warranties such as motor vehicle warranties are more specific.

is a special circuit board that usually plugs into an expansion slot to make a computer work faster. An example is a graphics accelerator that will speed up the time it takes to display images on the monitor.

(also called a cell site) is the tower and radio antenna, transmitter and other equipment that are used to communicate with mobile phones. A mobile network is made up of many base stations.

refers to the cost of individual calls made on a phone service. The call cost will depend on the time of day that you make a call and on the distance between you and the caller.

are provided by mobile phone service providers and explain how phone calls will be charged and any additional charges that are payable. Each mobile phone service provider will have a selection of call plans from which to choose.

is the value on a recharge card that can be used up in making mobile phone calls. It's normally used for pre-paid mobile phone services.

are organisations that can sell access to a mobile phone network.