191
Personal Unblocking Key or ‘PUK’ code which you can get
from O
2
Customer Service.
What is PIN2?
PIN2 is a security code that you can obtain by calling O
2
Customer Service.
What is IMEI?
IMEI stands for International Mobile Equipment Identifier
and is an identification system that can recognise every
mobile by a specific number. If a mobile is stolen, the IMEI
system is capable of blocking it on all network operators
that support the system.
What is WAP?
Wireless Application Protocol or WAP is a standard devel-
oped for mobile phones. It was designed to give quicker
access to mobile content than existing web protocols.
Using WAP will open services to you such as
O
2
Active which offers a wide variety of mobile services
and entertainment.
Abbreviations and Acronyms
190
What is roaming?
Roaming allows you to move from one base station (cell)
to another or from one network to another without affect-
ing the call.
What is tri-band?
A tri-band mobile has the capability to automatically switch
between frequencies. It can therefore operate on three fre-
quency bands, e.g. 900 Mhz, 1800 Mhz and 1900 Mhz. The
O
2
X3 is a tri-band mobile.
What is a SIM card?
Subscriber Identity Module or SIM is the little gold-plated
plastic card that you get from O
2
and which holds the
unique data the network needs to identify your mobile.
What is PIN* and what is PUK?
Access to use a mobile 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 page 182 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
* Pay & Go mobiles are not set up with a default PIN code.
