ZDNet

Has O2 PUK'd up mobile phone security?

Accessing locked mobile phones has never been easier - which is a good thing, says O2... O2 is offering users a quick and easy way to unlock mobile phones with a personal unblocking code (PUK) which ...
日経クロステック

[CRYPTO-GRAM日本語版]O2向け携帯電話機のロック解除用コード

正規の持ち主がミスタイプで携帯電話機をロックしてしまったり，暗証番号を忘れてしまったりした場合に対処するため，O2は問い合わせに応じてロック解除用コード「Personal Unlock Code（PUK）」を発行してくれる。
Engadget

O2 makes reviving locked phones a little easier

If you've ever found yourself facing a locked phone asking for its PUK code, you know that you're kinda in a bind when that happens. Typically you need to call your carrier, wait the standard 3.44 ...