Try entering password using blackberry desktop manager, then blackberry desktop manager will prompt you to enter password .
As far I know, you can use your PUK code to unlock blackberry curve 8300 password, just type any password until your phone asking you to enter puk code. PUK code can you found from your sim card bundle if you don't have it just call your service provider, they will give it to you. After you put that puk code your blackberry unlocked from old password.
SOURCE: how to unlock a blackberry password without losing
Hello
You have to unlock that BB first
This unlock code provider generate full LEGAL unlock code direct from
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based on your IMEI, means individual code for every blackberry set.
After unlocking from this provider's code your blackberry not only work
with single network, you can use your Blackberry in any part of world
with any
network
including your browser & MMS picture messaging to work, yes with
just one time entering code from your keypad.
They unlock from network who locked your blackberry
This site will help you a lot & good email & 24/7 phone support
http://blackberryimeiunlockcodes.com
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