Samsung Galaxy S5 User Manual page 268

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SIM change alert: Prevent unauthorized changes to your SIM
card by being alerted whenever an app or service attempts to
change data on your SIM card.
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Go to website: Launch the Find My Mobile website.
SIM Card Lock
Use this option to set up your password when one is first required or
change your current password.
1. From a Home screen, tap
2. Tap Security > Set up SIM card lock and follow the prompts.
Passwords
Display password characters briefly as you type them.
1. From a Home screen, tap
2. Tap Security > Make passwords visible to turn the feature on.
Settings
Apps > Settings.
Apps > Settings.
256 Security