PUK stands for Personal Unblocking Key. This is a unique eight digit code 
specific to your SIM card. This is required when the PIN number is entered 
incorrectly 3 times on your mobile phone. You are then given 10 attempts to 
enter your PUK if required. If an incorrect PUK code is entered after the 
10th attempt, you will block your SIM card permanently and will require a 
new SIM card.
http://www.revtel.com.au/faq_simcard.php

"Genys" <geniui@miskas.lt> wrote in message 
news:h36pg0$vcs$1@trimpas.omnitel.net...
> Bent anksčiau tikrai 10 kartų Pūką leisdavo rinkti.
>
> "saimhe" <oh.no@oh.my> wrote in message 
> news:h352h7$dmf$1@trimpas.omnitel.net...
>>> na kiek as zinau, tai 10 kartu PUK duoda vest
>>
>>  Tiksliai nežinau, o pasitikrint irgi nebežinau kur :)
>>
>> -- 
>>  saimhe
>
>