First go to phone settings then to security settings and then to lock code and give default code (refer manual if not known) and keep it on....
Hello Tanvi,
Touch Phone settings in the SETTINGS tab, then choose SECURITY. From there, add a pin code to your phone and turn on the handset lock.
Open menu> open Phone settings> open security settings/security keyguard and switch it to ON. Now it will ask for the phone's default pin which can be inputted and set.
This app is perfect for your needs to lock, and u can set password or pattern.And u can lock whichever lock u want. LEO Privacy Applock Hide Safe Android Apps on Google Play
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