Samsung Galaxy Note 4 User Manual page 166

Set Up or Change SIM Card
Lock
To prevent another person from using your SIM
card to make unauthorized calls or from accessing
information stored on your SIM card, you can protect
the information by using a PIN code.
When enabled, your device asks for a PIN number
each time you use the phone. Using this option you
can also change your SIM PIN number.
1. From a Home screen, tap
2. Tap Security > Set up SIM card lock.
3. Touch Lock SIM card, enter your SIM PIN code,
then touch OK.
Note: You must activate Lock SIM card before you can
change your SIM PIN code.
Settings
Apps > Settings.
164
To change your SIM PIN code:
1. Touch Change SIM PIN.
2. Enter your old SIM PIN code and touch OK.
3. Enter your new SIM PIN code and touch OK.
4. Re-type your new SIM PIN code and touch OK.
View Passwords
Display password characters briefly as you type them.
1. From a Home screen, tap
2. Tap Security > Make passwords visible to enable.
Apps > Settings.
Security