Samsung Galaxy S6 User Manual page 217

Require both your SIM card PIN and your ordinary screen lock type
when unlocking the device.
1. From a Home screen, tap
2. Tap Lock screen and security > Other security settings > Set up
SIM card lock and follow the prompts.
3. Tap Lock SIM card to enable the feature.
4. Tap Change SIM card PIN to create a new PIN.
View Passwords
Display password characters briefly as you type them.
1. From a Home screen, tap
2. Tap Lock screen and security > Other security settings >
Make passwords visible to turn the feature on.
Settings
Apps > Settings.
Apps > Settings.
205 Lock Screen and Security