Sony Ericsson K850i User Manual page 62

If you enter your PIN incorrectly three
times in a row, the SIM card is blocked
and you need to enter your PUK
(Personal Unblocking Key). Your PIN
and PUK are supplied by your network
operator.
To unblock the SIM card
1 When PIN blocked
PUK and select OK.
2 Enter a new four-to-eight-digit PIN
and select OK.
3 Re-enter the new PIN and select OK.
To edit the PIN
1 From standby select
> the General tab >
> SIM protection
2 Enter your PIN and select OK.
3 Enter a new four-to-eight-digit PIN
and select OK.
4 Re-enter the new PIN and select OK.
If Codes do not match
entered the new PIN incorrectly.
If Wrong PIN appears, followed by
Old PIN:, you entered your old PIN
incorrectly.
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Menu > Settings
Security > Locks
> Change PIN.
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To use the SIM card lock
1 From standby select
> the General tab >
> SIM protection
2 Select an option.
3 Enter your PIN and select OK.
Phone lock
You can stop unauthorised use of your
phone. Change the phone lock code
(0000) to any four-to-eight-digit
personal code.
It is important that you remember
your new code. If you forget it, you
have to take your phone to your local
Sony Ericsson retailer.
To use the phone lock
1 From standby select
> the General tab >
> Phone protection
2 Select an option.
3 Enter the phone lock code and
select OK.
To change the phone lock code
1 From standby select
> the General tab >
> Phone protection
2 Enter the old code and select OK.
3 Enter the new code and select OK.
4 Repeat the code and select OK.
Menu > Settings
Security > Locks
> Protection.
Menu > Settings
Security > Locks
> Protection.
Menu > Settings
Security > Locks
> Change code.