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You can try to use your PUK code to unlock samsung sgh u600 password. Puk code is a unique number to unblock your sim card and that code comes with your sim card paper. The idea is put any password until your phone asking your puk code, if your phone asking that code enter your puk code in your phone. It should be unlock samsung old password so you can setup new password.Good luck!
Normally the default code is as you stated "0000"
You would normally get the code from your network provider.
You can try doing it this way instead though:
The [SEND] button is your call button, green phone symbol.
So for example to cancel call barring you should type #330#0000# [SEND]
To Activate: * 330 * BARRING CODE # [SEND] To Cancel: # 330 * BARRING CODE # [SEND]
ring your service provider eg o2,orange,vodafone and give them your mobile number and details and they will give you your puk code.Do not try to guess it as you will totally block your sim after 5 tries