Before you can unlock your Chromebook with your Android phone, you must first pair both devices. However, keep in mind that this functionality is only available for phones running Android 5.1 or later and Chromebooks with at least the Chrome OS 71 update.
For this to work, you also need to make sure that both your Chromebook and Android phone are signed in with the same primary Google account.
Then on your Chromebook, click on the status area at the bottom right corner of your screen, where it shows the Wi-Fi and battery status. In the next panel, select the gear icon to open the Settings menu.
Scroll down to the “Connected Devices” section and click the “Setup” button next to the “Android Phone” option.
In the popup window, choose your Android phone from the ‘Select a device’ drop-down list. Then select the blue button “Accept and continue” at the bottom.
On the next page, log in with your Google credentials. You should soon see a confirmation box “All Set”. Click on “Done” to close the window.
Go back to your Chromebook’s Settings menu and this time you will find the ‘Verify’ option under ‘Connected Devices’. Select this and then unlock your Android phone if it is not already unlocked. You should receive a notification that your Chromebook and Android phone are paired on both devices.
Go back to Settings> Connected devices on your Chromebook and select your Android phone. Enable the “Smart Lock” option and key in your Chromebook’s password.
Lock your Chromebook to test if Smart Lock is active by long pressing the dedicated button on the keyboard.
Once you unlock your Android phone with Bluetooth, the lock icon next to the password field will change from orange to green. This means that you are authenticated. All you need to do now is click on your account picture to unlock the Chromebook.
Likewise, you can access and reply to text messages from your Android phone on your Chromebook.
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