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Go to Settings, then to Phone settings, then to Security settings (might be under Phone management on some phones), then to Phone and Sim card and their change the value of Lock if SIM card changed value to from YES to NO, if asked for lock code try 12345 or 00000.
Your phone’s four-digit lock/unlock code is originally set to 1234. The six-digit security code is originally set to 000000.
If you forget your unlock code: At the Enter Unlock Code prompt, try entering 1234 or the last four digits of your phone number. If that doesn’t work, press and enter your six-digit security code instead. .
If it is a flip phone, most flip phones dont offer the ability to lock the keys because they are thinking there isn't a need for that since the keys are hidden by the top of the phone, if it is a candybar phone usually the menu key and the * (star) key are used to lock and unlock your phones, if its a smart phone there may be some options in the settings. You didnt mention what brand your phone is based on the model number sounds like a samsung. you can go to samsungs website and research the model number and usually they have information on how to do everything you need with the phone. most cell phone carriers have this info too, you may have to dig threw the website a little though