| Mobiles are designed to work on cellular networks and contain a standard set of services that allow phones of different types and in different countries to communicate with each other. Before the phone can be used, a subscription to a mobile phone operator (a.k.a. carrier) is required. For phones on GSM networks, the operator will issue a SIM card which contains the unique subscription and authentication parameters for that customer; alternatively, the carrier will put the customer's handset identifier into its subscriber database so that the handset can make calls on the network. Once the SIM card is inserted into the phone, services can be accessed. Many mobile phones support 'auto-roaming', which permits the same phone to be used in multiple countries. For this to work, the operators of both countries must have a roaming agreement. Mobile phones include an alarm. Usually it still functions while the phone is turned off or in silent mode. Mobile phones do not only support voice calls; they can also send and receive data and faxes (if a computer is attached), send short messages (or "text messages"; see SMS), access WAP services, and provide full Internet access using technologies such as GPRS. Mobile phones usually have a clock and a calculator and often one can play some games on them. Most current models also allow for sending and receiving pictures and have a built-in digital camera, that can have resolutions as high as 5M pixels (Nokia N95). Sound and video recording is often also possible. This feature is generally referred to as MMS. This gives rise to some concern about privacy, in view of possible voyeurism, for example in swimming pools. For this reason, Saudi Arabia has entirely banned the sale of camera phones; South Korea has ordered manufacturers to ensure that all new handsets emit a beep whenever a picture is taken. GPS receivers are starting to appear integrated or connected (i.e. using bluetooth) to cell phones, primarily to aid in dispatching emergency responders and road tow truck services. This feature is generally referred to as E911. |
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