Set Up Find My iPhone
With Find My iPhone, you don't have to worry as much about losing your devices. Once you've enabled the feature, you will be able to see the location of all your devices on a map. To find your device, open Apple's Find My iPhone app and sign in with your Apple ID. Make sure you're signed in to your iCloud account on each one. Then go to Settings > iCloud, and make sure Find My iPhone is toggled on. Now you can find your missing devices anywhere via the app, which displays their last known location on a map. When you tap on the missing device, you'll be given the option to Play Sound, Lock, or Erase Device. Set Up Touch ID
Touch ID is a fingerprint sensor that allows you to make transactions with Apple Pay, authenticate purchases in the App Store, sign in to Touch ID-enabled apps, and unlock your password-protected iPhone simply by pressing your finger on the Home button.
To set up Touch ID, go to Settings > Touch ID & Passcode. You'll be prompted to enter your passcode. Under Fingerprints, tap Add a Fingerprint and follow the prompts. Once you've added your fingerprint, Touch ID will automatically be enabled for iPhone Unlock, Apple Pay, and iTunes & App Store. Toggle off any of the services you don't wish to use Touch ID for.
Your iPhone automatically locks itself after a set period of inactivity. This saves battery life and makes unauthorized access to your iPhone less likely. The default auto-lock setting is one minute; but if you find yourself constantly having to unlock your phone in the middle of using it, you may need to change the delay time.
To change the delay time, go to Settings > General > Auto-Lock. You can set your iPhone to lock after a delay of one to five minutes, or choose Never. Remember, the longer the auto-lock delay, the more likely your phone can be taken and tampered with. Prevent People from Accessing Information via Siri
Want to text a friend or view your most recent calls? Just ask Siri. You can even do all this from your lock screen. The problem is, so can anyone else. If your settings allow for it, anyone can access your call history, send a tweet, or get directions to a contact's home from your Lock screen just by bringing up Siri and asking.
To prevent anyone from being able to access this information from your Lock screen, go to Settings > Touch ID & Passcode and scroll down to Allow Access When Locked and toggle Siri off. Siri can still do all the same things, just no longer from your Lock screen.