Bosch GSM 1900 User Manual

To prevent misuse of your SIM card, e.g. if it is lost
or stolen, you can select a PIN code to be entered
each time you switch on the phone.  

The PIN code is a 4 to 8-digit number of your
own choice, which you can change any time 
you like.

If you enter an invalid PIN code three times, your
SIM card will be blocked and to unblock it you
have to enter the PIN Unblocking Key (PUK) code
supplied by your network operator. This proce-
dure prevents unauthorized person from working
out your PIN code by repeatedly entering different
combinations of numbers. 

The display will inform you how many tries you
have left before the SIM card is blocked. If you
enter an invalid PUK code 10 times, your SIM
card will be permanently blocked and you have
to contact your network operator to have it un-
blocked.

Some SIM cards use a PIN2 code for accessing
special functions. Contact your network operator
for further information on PUK2 and PIN2 codes.

1. Press  

2. Select  

using 

3. Confirm by pressing  

4. Select using 

either

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5. Confirm your choice by pressing  

You can link your telephone and your SIM card
together. This means that if, for instance, your
phone is stolen it cannot be used together with
another SIM card. To enable this feature just select

and enter an 6 to 16-digit code

of your own choice. 

For your own sake remember

to write down this code to be able to deactivate
the lock at a later time. You have 10 attempts be-
fore the phone is blocked.

User Guide 738/718 GB  29/04/99 9:59  Side 36