Nokia 3555 - Manual (Page 29)

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■ Functions without a SIM card
Several functions of your phone may be used without installing a SIM card
(for example, the data transfer with a compatible PC or another compatible
device). Without a SIM card, some functions appear dimmed in the menus
and cannot be used.
For an emergency call, some networks may require that a valid SIM card is properly
inserted in the phone.
■ Access codes
Security code
The security code (5 to 10 digits) helps to protect your phone against
unauthorized use. The preset code is 12345. To change the code, and to set
the phone to request the code, see "Security," p. 66.
PIN codes
The personal identification number (PIN) code and the universal personal
identification number (UPIN) code (4 to 8 digits) help to protect your SIM
card against unauthorized use. See "Security," p. 66.
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," p. 95.
The signing PIN is required for the digital signature. See "Digital signature,"
p. 96.