If you don’t know the answer to that question, I strongly suggest spending five minutes on a one-time-setup to secure your Android or iOS device. It’s super easy, really fast, and it’ll protect you in case anything happens in the future. Here’s how.

For Android:

1) Enable Android Device Manager for remote trackingdisabling.
2) Set up a passcode.
3) Enable two-factor authentication for everything you have.
4) Encrypt your phone.
5) Add owner info to your lockscreen.

Source: The Essential Android Security Features You Should Enable Right Now

For iPhone:

1) Enable “Find My iPhone.”
2) Set up a passcode.
3) Enable iCloud backup.

Source: This Is How You Should Secure Your iPhone

Enjoy!