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Glossary 107
Glossary
Advice of Charge
(or AoC) enables you to monitor the cost of calls made from your mobile
phone. Details of the last call and total calls made are shown in the phone
display.
Area Information
(or AI) is a service that allows you to receive messages about pre-set topics
i.e. weather forecasts, road reports, etc. To use this service, it must be sup-
ported by your network.
Calling Line Identification
(or CLI) shows the number of the person calling you in your mobile phone
display. You can then make an informed choice as to whether or not to take the
call. Bear in mind that not all numbers can be displayed. To use this service, it
must be supported by your network.
Call Barring
enables you to restrict or bar certain or all types of calls to and from your
mobile phone, i.e. outgoing calls, outgoing international calls, incoming calls.
Barring is activated with a personal code. To use this service, it must be sup-
ported by your network.
Divert
enables you to forward calls to another number, for example your voice mail
or home phone.
DTMF or Touch Tone
Dual Tone Multi Frequency signal – codes sent as tone signals. Used for tele-
phone banking, for accessing an answering machine, etc.
Dual Band GSM 900/1800
The Ericsson R250s PRO is a dual band phone, which means that you can use
your phone on two different kinds of networks – the GSM 900 and the GSM
1800 (also called PCN or DCS 1800) systems.
A dual band phone that combines the two standards can use both frequencies.
This increases capacity in densely populated urban areas, and consequently