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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!
You should be able to reset this by turning on the phone without the SIM card inside, then entering *2767*2878# and waiting for the phone to reset. Once it starts up, the code should be gone from the phone and you should be able to get into it again.
hi Try with all the code to see whether you can get one to unlock your phone. If all still cannot help then you can only contact Samsung Support for help. I hope these information below at least can give you some hints:
Note try codes which help direct unlock for either SIM Lock or Security Lock first before try other codes
*2767*3855# - FULL E2P RESET *2767*2878# - CUSTOM E2P RESET #*7337# - UNLOCK *2767*688# - UNLOCK *#0523# - CONTRAST *#9998*523# - CONTRAST *#8999*8378# - Service Menu (X100)
First with different carrier SIM in phone at WRONG CARD screen ENTER on the keypad *2767*3855# (wait 10-15 seconds) phone will reboot(restart) When phone completes reboot ENTER *7465625*638*00000000*00000000# NEXT ENTER #7465625*638*00000000# AND THEN *#7465625# to check the locks....all locks are inactive...these are all the locks... network lock - inactive subset lock - inactive sp lock - inactive cp lock - inactive sim lock - inactive activa lock - inactive phone lock - inactive auto network - inactive auto subset lock - inactive auto sp lock - inactive auto cp lock - inactive
I think you have a Network locked. You can check on Ebay to buy an unlocked code. The seller will provide you the code with instruction of how to unlock it. You should prepare your phone IMEI number to give to the seller in order to get a proper code. In order to know your phone IMEI number, just type *#06# Good Luck