System found on digital mobile phones whereby the number of
an incoming caller is displayed on-screen before the phone
is answered. The service is also available on fixed phones,
but requires a special phone or add-on display unit, and necessitates
paying BT an additional quarterly fee.
Facility on some answering machines that allows the user
to hear who’s calling so they can decide whether to
answer in person or not.
Code Division Multiple Access: Digital cellular standard
used in Japan, parts of the Far East and parts of the USA.
Uses coding of digital segments of calls to enable them
to use vacant channels over a broad range of frequencies.
Service provided by digital cellphone networks where useful
info is provided to users via on-screen text messages. Currently
used by Vodafone and BT Cellnet to inform customers of the
STD code of the area they are currently located –
enabling them to take full advantage of local call discount
A radio phone system in which a network of transmitters
links the mobile user to the public phone system. Each transmitter
covers users in its own ‘cell’.
Calling Line Identification. A range of services in which
the number of a caller can be accessed by the recipient.
The 1471 service offered free to BT customers is one of
these – as is the caller display service provided
to digital cellphone users.
Whereby a ‘cloned’ analogue cellphone is illegally
re-chipped with an ESN belonging to another. Can also refer
to a phone ‘badged’ by one company and sourced
The area in which a cellphone can make or receive calls.
Coverage is usually expressed by
networks as a percentage of the resident population who
could use mobiles outside their own homes. Geographic coverage,
therefore, is far inferior to this ‘by population’
The standard used by first-generation cordless phones. This
analogue system can make use of just eight channels (some
phones use only one), which can lead to problems with interference,
particularly in built-up areas.