Panasonic EB-GD90 - Manual (Page 46)

Registration
The act of locking on to a GSM network. This
is usually performed automatically by your
phone.
Roaming
The ability to use your phone on networks
other than your Home network.
Service
Provider The organization responsible for providing
access to the GSM network.
SIM
Subscriber Identity Module. A small
smart-card which stores unique subscriber
and user-entered information such as
Phonebook and Short Messages. Supplied by
your Service Provider.
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Glossary of Terms