"Screen lock" refers to the security feature on electronic devices, like smartphones or computers, that prevents unauthorized access to the device by requiring a password, PIN code, pattern, or fingerprint to unlock the screen. Full definition
There is also a head phone jack and the volume controls as well as screen lock buttons. (goodereader.com)
Select your security type: You can choose what you can use to unlock your phone by heading into settings > lock screen and security > screen lock type. (pocket-lint.com)
When your partner starts changing passwords and putting screen locks on gadgets that weren't there before, then something has definitely changed in your relationship and your partner could be hiding something. (prevention.com)