Panasonic EB-G51E - Manual (Page 83)

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PUK/PUK2 PIN/PIN2 Unblocking Key. Used to unblock the PIN/PIN2. Supplied by your service provider. If the PUK/
PUK2 is entered incorrectly 10 times, the PUK/PUK2 will be blocked.
Registration The act of locking on to a GSM/GPRS 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/GPRS 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.
SMS Short Message Service. A basic mail system used for cellular phones. This service allows sending/receiving
short text messages.
WAP Wireless Application Protocol. The communication standard which enables you to download resources from
the Internet to your phone.