O2 X1i How To Use Manual - What Is Roaming?
Abbreviations and Acronyms
164
What is roaming?
Roaming allows you to move from one base station (cell)
to another or from one network to another without
affecting the call.
What is tri-band?
A tri-band mobile has the capability to automatically switch
between frequencies. It can there f o re operate on thre e
f requency bands, e.g. 900 Mhz, 1800 Mhz and 1900 Mhz.
The O
2
X1i 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 155 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.