My daughters phone says "pin blocked , enter PUK

The PUK code can be found in the packaging of the sim card when you first bought it.
Several wrong tries for a pin code can get the sim card blocked and only the PUK code can enable it for access. If you can't find the PUK code, you have to buy another sim card or if this is postpaid, you have to report it to your Telecom Operator.

You don't need LG GW300 network unlock code if your phone only locked by password login. Call your provider and request PUK code for your phone and it's free not charge any amount from you. After you get that PUK code enter it and your lg unlocked like new one.

Get the unlock code here http://www.wickedunlock.com/unlock-your-phone/rs11wp2/ and for puk code contact the service provider..