138
uses the network with the strongest signal and even
switches networks during a call within the same operator’s
network.
GSM
(Global System for Mobile Communication)
International standard for cellular communication,
guaranteeing compatibility between the various network
operators - GSM covers most European countries and
many other parts of the world.
Phone Password
Security code used to unlock the phone when you have
selected the option to lock it automatically each time it
switches on.
PIN (Personal Identification Number)
Security code protects the phone against unauthorized use.
The service provider supplies the PIN with the SIM card.
The PIN may be a four to eight-digit number and can be
changeable, as required.
PUK (PIN Unblocking key)
Security code used to unlock the phone when you have
entered an incorrect PIN three times in succession. The
service provider supplies the eight-digit number with the
SIM card. If you input incorrect PUK 10 times, the SIM card
will be blocked and will not be able to use the SIM.
Roaming
Use of your phone when you are outside your home area
(when traveling for example)