Sony Ericsson V800 User Guide

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Settings
To reset all profile settings
SIM card lock
The SIM card lock protects your subscription, but not your 
phone itself, from unauthorized use. If you change SIM cards, 
the phone still works with the new SIM card.
Most SIM cards are locked at the time of purchase. If the 
SIM card lock is on, you have to enter a PIN (Personal Identity 
Number) every time you turn on your phone.
If you enter your PIN incorrectly three times in a row, 
the SIM card is blocked. This is indicated by the message 
PIN blocked. To unblock it you need to enter your PUK 
(Personal Unblocking Key). Your PIN and PUK are supplied 
by your operator.
To unblock your SIM card
1. When PIN blocked is displayed, enter your PUK 
2. Enter a new four- to eight-digit PIN 
3. Re-enter the new PIN to confirm 
To edit your PIN
To turn the SIM card lock on or off
1.
2. Enter your PIN 
OK.
Note: If the message Codes do not match appears, you 
entered the new PIN incorrectly. If the message Wrong PIN
 
appears, followed by Old PIN:
, you entered your old PIN 
incorrectly.
Phone lock
The phone lock protects the phone against unauthorized use 
if it is stolen and the SIM card is exchanged. It is not on when 
you buy the phone. You can change the phone lock code (0000) 
to any four- to eight-digit personal code.
Phone lock on
If the phone lock is on, the message Phone locked appears 
each time you turn on the phone. You have to enter your code 
followed by Yes to use your phone.
Automatic phone lock
If the phone lock is set to automatic, you do not need to enter 
your phone lock code until a different SIM card is inserted in 
the phone.