Operation Manual

196
14
Troubleshooting
14. Troubleshooting
14.1 Glossary
Roaming
Your phone will go into roaming services
when you are not in your home network.
For more information on roaming services,
please contact your network operator.
Handover
Your phone will perform a soft handover
without affecting the call or data transmission
when moving from one base station to
another, from one network to another or
when the signal strength degrades with
neighboring cell sites of stronger signal
strength detected.
Tri-band
Different operators/countries may operate
on different GSM frequencies. The O
2
Xda
Flame is a tri-band Pocket PC Phone that
can switch between these three frequencies
(900, 1800, and 1900 MHz).
SIM card
A Subscriber Identity Module (SIM) is a
removable smart card, roughly the size
of a postage stamp, that securely stores
the key identifying a mobile phone service
subscriber. The SIM card allows users to
change phones easily by removing the SIM
card and inserting it into another mobile
phone, thereby eliminating the need for
activation of the new mobile phone on the
network. The use of a SIM card is mandatory
in the GSM world.
PIN and PUK
Access to a 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. If you forget your code, or by
mistake enter a faulty code three times, the
SIM card will lock. To unlock it, you must
enter the Personal Unblocking Key, or “PUK”
code, which you can get from your network
operator.
USIM card
The equivalent of a SIM in UMTS is called
the Universal Subscriber Identity Module
(USIM). It is an application for UMTS mobile
telephony running on a UICC smart card
which is inserted in a 3G mobile phone.
It stores user subscriber information,
authentication information and provides
storage space for text messages.
3G
3G Systems are intended to provide a
global mobility with wide range of services
including telephony, paging, messaging,
Internet and broadband data. International
Telecommunication Union (ITU) started the
process of defining the standard for the
third generation systems, referred to as
International Mobile Telecommunications
2000 (IMT-2000). In Europe, European
Telecommunications Standards Institute
(ETSI) was responsible for the UMTS
standardisation process.
UMTS
Universal Mobile Telecommunications
System (UMTS) is one of the third-
generation (3G) mobile phone technologies.
The currently most common form uses