How to Lock and Unlock an Android Phone With Your Voice Using Google Assistant
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There’s no limit to the kinds of things Google Assistant can help you with, from checking traffic to playing music and videos and much more. One nifty trick you can add to your Google Assistant arsenal? Using it to lock and unlock your Android phone.

How to Get Google Assistant

If you don’t already have Google Assistant on your phone, you should be able to get it by joining the Google and Google Play Services Beta program. To see the complete step-by-step process, check out the video below:

How to Unlock Your Phone

Once you have Google Assistant on your phone, you can unlock your phone just by saying “Ok Google.” This will launch the Google Assistant app, and then you can interact with your phone: launching apps, check your email, make phone calls, and do any of the many things Google Assistant lets you do.

We’ve found that with some phones this can be a little glitchy, and on occasion you may be prompted to enter your PIN code or pattern to unlock the phone first.

How to Lock Your Phone

Locking your phone is a slightly more cumbersome process as it’s not built in to Google Assistant’s native settings.

  1. First, you’ll need to install an additional app that can lock your phone. Any of the following apps will do the trick:
  2. Once installed, open Google Assistant and tap the drawer icon.
  3. Tap the menu (three dots) button and go to Settings > Shortcuts.
  4. On the Shortcuts tab, tap the blue + button.
  5. Fill in a new shortcut with the following information:
    • When I say Ok Google: Lock phone
    • Google Assistant Should do: Open Screen Off
  6. Tap Save.

You can change the voice command to anything that feels comfortable for you, and can substitute Screen Off for the app of your choice.

We’ve found that launching Google Assistant, saying Ok Google, and pausing will ensure that it works properly. If you don’t pause, Google may give you some search results instead.

Do you use voice commands to lock or unlock your phone? Do you find the process useful or cumbersome? Let us know what you think in the comments. 

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  1. Shachikanta Ningthoujam
    November 23, 2017 at 2:16 pm

    In MI note 3 cannot work unlock my phone by Google assistant, please solve it, thanks

  2. Matt
    October 16, 2017 at 12:38 pm

    I keep trying to unlock phone with Google but it says that voice lock is aided. How do I unpause it so I can unlock the phone with just my voice?

  3. David Cardillo
    September 18, 2017 at 10:37 am

    From the article:

    How to Unlock Your Phone: say, "ok, Google."

    But, "you may be prompted to enter your PIN code or pattern to unlock the phone first."

    You can typically make a phone call, but launching apps requires an unlock.

    So, fail.

    How to Lock Your Phone:

    Purchase 3rd-party apps, none of which are listed will actually lock your phone, but just turn off the screen. You have to set your phone to lock immediately thereupon.

    • Dusan
      September 20, 2017 at 8:33 pm

      HOW TO LOCK YOUR ANDROID DEVICE USING GOOGLE ASSISTANT:
      1. settings ---> security ---> screen lock (i use pattern)
      2. google play store ---> download and install "Screen Off and Lock" (grant it administrative rights)
      *most of similar apps will do the trick*
      3. follow the article' author' instructions (assistant ---> drawer
      icon ---> menu (three dots) ---> shortcuts ......
      P.S.:
      Far from fail, actually.

      HOW TO UNLOCK YOUR ANDROID DEVICE USING GOOGLE ASSISTANT:
      Not at all a complicated process albeit it might not look that way at the moment ;)
      settings ---> security ---> smart lock ---> choose "trusted voice" and enable it on the next screen
      Try it and let me know if additional help/assistance is needed.
      Be advised that "trusted voice" may pose significant security vulnerability issues due to someone with a similar voice might being able to unlock your device and/or gain complete and unrestricted access to it. As i'm very aware of the risks of using such "new age" solutions (trusted face, trusted location etc), i only use it for fun. If looking for effective phone lock solutions, sadly even with all the fingerprint/face/retina scanning, the safest is still good ol' pin (alphanumeric, low and high caps lock, special symbols).
      Take care & good luck.

      • dc
        September 20, 2017 at 9:27 pm

        1) read what I wrote, not what you think I wrote.

        "How to *UNlock* your phone..." (emphasis added)

        "OK Google" will only allow you to make phone calls or take a picture — things you can do without unlocking the phone. To launch an app that requires the user interface, you will need to unlock the phone (with your swipe pattern, which I can see in the grease on the screen).

        or, "how to unlock your phone with your voice — use your voice, then use your passcode."

        That is what is written in the article. That method fails. (as does your reading comprehension.)

        Also: as I said, "How to *LOCK* your phone..." you need to download and install 3rd-party apps. That is not "using Google Voice." That is "telling Google Voice to launch an app — that just turns your screen off."

        None of those apps actually lock your screen. Yes, I installed them. Yes, I used them. No, they don't.

        2) enabling *insecure* access to the phone (facial or voice recognition) defeats any purpose for which you would want to secure your phone with your voice.

        Example: the kindly officer politely asks you to hand over your phone.

        A) you start tapping items on the screen until you are tasered;
        B) you long-press the power button, in the hope that your arm isn't wrenched behind your back or you're thrown to the ground within the 10 seconds you're not complying with orders that it takes to power off the phone;
        C) you say, "OK Google..." wait for the beep, and hope you're still able to speak clearly enough to launch the app that turns the screen off — which can be turned right back on again with the power button. (they don't even need to hold your finger on the fingerprint ID.)
        D) you've enabled facial recognition, "on-body" detection, as well as SmartLock-linking your smartwatch and bluetooth headphones, so if they can't just hold the phone to your (now bleeding) face, it never really locks.

        right now one app works — sort of: Screen Lock Pro (I don't think I can post URLs — be careful, virtually every app that turns off the screen is called a variant of "screen lock." This one is written by Yogesh Dama. the identifier is "com.bhanu.screenlock")

        The problem is launching the app brings up the "first launch" configuration. You need to launch it from the widget or notification icon to actually lock the screen.

        And yes, locking it this way disables fingerprint ID.

  4. Darryl
    August 29, 2017 at 9:21 pm

    I use the Google Assistant quite often to lock my device and lots of other things. I love it! I haven't found an app yet to unlock my device while the device is already locked. Can you give me some advice on apps that can help me with that?

  5. dc
    August 2, 2017 at 2:23 pm

    locking the screen is one thing, but can you power it down?

    I have a fingerprint lock. One could be physically forced to apply one's finger and unlock the phone. (also why you should never, ever, use facial recognition to lock it)

    restarting enforces the use of a password

  6. Oneplus 3
    July 5, 2017 at 3:27 pm

    Settings - Security - smart lock - trusted voice
    Job done without additional applications

    • Huh?
      July 6, 2017 at 12:13 am

      Trusted voice won't lock the phone. It'll unlock the phone because it "trusts" your voice.