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Hi, Free unlock codes may not always be safe.If you enter over a certain amount of wrong unlock codes, your phone may get hard locked and sometimes become unusable. So it is better to choose a reliable and paid unlocking service. You can get the unlock code for your Samsung SGH-Z140 either from your service provider or from reliable online sites. Simpleunlocking.com is where i unlocked my phone, Check it out!!
go to menu then click settings, security, change security code, type 12345 (default security code). after this step the phone will ask you to enter a new code after this, you will be asked to verify the code (need to retype your new security code then) then, your code is changed.
to activate the security code for your phone to use:
1. go to settings 2. choose security 3. choose security level 4. choose phone 5. restart your phone
after the restart, you will be asked to type first your new personalized security code before you can use your phone.
its not have keypad code lock but you ll put protect code lock go setting general and click the LOCK and then click the PHONE LOCK and click PROTECTION that ll ask default code its 0000 if you changed that code type your code.....