Nokia 8800 - Text Messages (SMS); Multimedia Messages (MMS); Read and Reply to SMS

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PIN codes
The PIN (personal identification number) code and the UPIN (universal personal
identification number) code (4 to 8 digits) help to protect your SIM card against
unauthorized use. See Security, page 80.
The PIN2 code (4 to 8 digits) may be supplied with the SIM card and is required for
some functions.
The module PIN is required to access the information in the security module. See
Security module, page 110.
The signing PIN is required for the digital signature. See Digital signature,
page 111.
PUK codes
The PUK (personal unblocking key) code and the UPUK (universal personal
unblocking key) code (8 digits) is required to change a blocked PIN code and UPIN
code, respectively. The PUK2 code (8 digits) is required to change a blocked PIN2
code.
Barring password
The barring password (4 digits) is required when using the Call barring service.
See Security, page 80.