Protecting your mobile devices is another thing you can do to remain cyber aware. Using a passcode or thumbprint to secure your device is a good way to protect your device. Ensure you lock your device whenever it is not in use.
Many devices also come with options that allow you to disable it remotely in case the device is lost or stolen.
Tracking apps such as findmyphone and others are useful when locating your device at home however it is not recommended that you venture out to unfamiliar places to recover your device.
Avoid third-party apps. If you’re on an iPhone, you don’t have much of a choice. However, for Android users, staying on Google Play and not allowing apps from unknown sources keeps you relatively safe. If you do decide to use third-party apps, research to be sure you’re not getting a malicious one. Read reviews, and if the app asks for access to too much personal data up front, don’t download it.
Source: https://blog.malwarebytes.com/101/2016/09/top-10-ways-to-secure-your-mobile-phone/