How to turn off Google voice search on a smartphone. Disabling Google Assistant on Android. How to completely turn off the Google voice assistant on your phone. Settings - System & updates - System navigation. Find "Turn the Google Assistant on when you press the Home button" and toggle the switch to the left "Off". Settings - Accessibility & convenience - Power buttons - Press and hold the power button. Switch to the "Power menu". Settings - Apps - Default apps - Digital assistant. Select "None". Settings - Apps - Manage apps - Assistant. Click the "Disable" button. Settings - Google - Settings for Google apps - Search, Assistant & voice control - Voice - Voice output. Slide "None". In the settings at the top in the Search bar, type "Voice Match" and open it from the search results. Disable the Google Assistant.