Under “Notifications” > “Background Notifications,” tap “Show.” Open the Signal app and click the gear icon in the top-left to get to Signal’s settings.The options are “Show all notification content,” “Hide sensitive notification content,” or “Don’t show notifications at all.” I recommend you choose “Hide sensitive information content” - this way you’ll still be notified when you get a Signal message, but you’ll have to unlock your phone to see who it’s from and what it says.Open the Settings app, and under “Device” > “Sound & notification” select “When device is locked.”.Here’s how to lock down your Signal notifications. Right: Signal notification on locked iPhone. Left: Signal notification on locked Android phone. Displaying messages on the lock screen is Signal’s default behavior, but you should change this if your phone is frequently in physical proximity to people who shouldn’t see your Signal messages - roommates, coworkers, or airport screeners, for example. Signal’s powerful encryption won’t necessarily help you if other people can see incoming Signal messages displayed on your lock screen. You should also update all of your apps in the App Store app under the Updates tab. You can check for iPhone updates in the Settings app under General > Software Update. Updates fix security bugs, so every day you haven’t installed them is a day you’re vulnerable to attack. I wrote about this in detail in February - skip to the bottom of that article for instructions on changing your passcode, and for considerations about using Touch ID. Avoid using anything obvious such as birthdates. Everyone should use at least a six-digit passcode, and you should up that to 11 digits if you’re concerned that your phone might fall into the hands of a powerful attacker like a government. iPhones automatically have encrypted storage, but this encryption only protects your data if you lock your device with a passcode. You can check for Android updates by opening the Settings app, and under System tap “About phone” > “System updates.” You should also update all of your apps from the Play Store promptly. You can do this from the Settings app under Security > “Encrypt phone.” Note that you need to have a full battery before Android lets you encrypt your phone, and you may have to wait up to an hour while your phone is encrypting. Encrypting the flash memory on your phone blocks such an attack by scrambling your data so that it can only be unlocked using the same pattern, PIN, or password used to unlock your phone. A screen lock is not much use if a thief can copy your phone’s data to a different device. Don’t tell anyone how to unlock your phone unless you’re OK with them reading all of your encrypted messages. You can do this from the Settings app under Security > “Screen lock.” Try to make it random, and avoid using anything obvious such as birthdates.
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