User's Guide

MISCELLANEOUS
To remedy the situation move closer to the nearest mast if possible or seek higher ground. If you
are inside a building, try moving towards a window.
What is roaming? Roaming is the technique that allows subscribers to move from one cell to
another or from one network to another without affecting the call.
What is digital? Early cellular phones relied on analogue systems.
Analogue radio systems transmit the voice signal in its original form, whereas digital technology
transforms the microphone signal into number sequences (digits) and transmit these.
When received, the digital signal is decoded so that you can hear the sender’s voice.
Digital signals do not degrade in quality as long as the data is received, and they can be
compressed to take up less memory.
What is Dual Band? A dual band cell phone has the capability to automatically switch between
frequencies and can thus operate on two or more frequency bands, e.g. 900 Mhz and 1800 Mhz.
What is GSM? Global System for Mobile communications is the most widespread standard for
digital communication in Europe, Australia and in large parts of Asia and Africa.
GSM uses frequencies in the 900 and 1800 Mhz bands.
What is APN? APN stands for Access Point Name and is basically an URL address on the Mobile
Internet.
What is GPRS? General Packet Radio System is a service protocol built on GSM technology.
GPRS allows several mobile phone users to share the same connection. Charges may thus be
based on the amount of transferred data rather than on airtime.
ABBREVIATIONS AND ACRONYMS
MISCELLANEOUS
What is CSD? A wireless service protocol used for WAP. CSD stands for Circuit Switched Data
and will enable continuous connection and payment by the amount of data transferred.
What is SIM? Subscriber Identity Module or SIM is the little gold-plated plastic card that you get
from your network operator and which holds the unique data the network needs to identify your
phone.
What is PIN and what is PUK? Access to use a cell phone is most often protected by a code
known as “PIN” - Personal Identification Number. Your SIM card comes with a default PIN that you
can change to any code you prefer. See p. 80 for details. If you forget your code, or by mistake
enter a faulty code three times in a row, the SIM card will lock. To unlock, you must enter the
Personal Unblocking Key or “PUK” code that came with your SIM card.
What is IMEI? IMEI stands for International Mobile Equipment Identifier and is an identification
system that can recognize every mobile phone by a specific number. If a phone is stolen, the IMEI
system is capable of blocking it on all network operators that support the system.
What are MCC and MNC? Mobile Country Code is a code that identifies the country in which the
subscriber lives. Mobile Network Code identifies the network operator.
What is DTMF? Dual Tone Multi Frequency or DTMF is a paging and remote control protocol that
allows you to control certain functions via your phone, e.g. listening to your answering machine.
ABBREVIATIONS AND ACRONYMS
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