The SIM card issued by your service provider has a security feature called PIN code protection. The Personal Identification Number (PIN) is a number
put on to the card by your service provider, and is 4 to 8 digits long. Some service providers supply SIM cards which will cause your phone to prompt for
a PIN code when it is turned on. If this is the case, enter your code with the phone's keypad. If you insert a SIM card other than your own, information
such as call logs may be lost (see "Security (M17)" on page 25 for details).