Set up a passcode to lock your device under Settings > Passcode.
That's it. Wasn't that easy? The PIN or passcode not only creates a lock screen, it also encrypts the iPhone or iPad data.
Not all of it, however. The things that are encrypted in this dead-easy method are your Messages, email messages and attachments, and data from some apps that offer data encryption.
You definitely should have a passcode set up, though, and not just the default 4-digit one. Use a stronger, longer passcode or passphrase in your Passcode settings (at least 6 digits long). Even just two digits more make your iPhone much more secure.
On Android devices, the lock screen and the device encryption are separate but related. You can't encrypt your Android device without the screen lock turned on, and the encryption password is tied to the screen lock passcode.
Your device may restart several times during the encryption process. Wait until the entire process is finished before using it.
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