CMF Phone 2 Pro Voice Assistant Not Working? 10 Fixes (2026)

When your CMF Phone 2 Pro's voice assistant stops responding, it can feel like you've lost a helpful tool right in your pocket.

Mar 27, 2026
7 min read
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When your CMF Phone 2 Pro's voice assistant stops responding, it can feel like you've lost a helpful tool right in your pocket. The issue can pop up for a few different reasons, but it's usually something you can fix yourself. Let's walk through the steps to get it working again.

Check Your Voice Assistant Settings

First, let's make sure the voice assistant is actually enabled on your phone. Head into your settings and navigate to Apps > Default apps > Assist & voice input. Here, you'll see which assistant is set as your default.

If you're using Google Assistant, open the Google app and tap your profile picture in the top right. Go to Settings > Google Assistant > Hey Google & Voice Match. Ensure "Hey Google" is toggled on and that your voice model is trained. I'd start with this check, as it's the most common fix.

Restart Your CMF Phone 2 Pro

A simple restart can clear out temporary software glitches that might be blocking the microphone or the assistant service. Press and hold the power button for about 10 seconds until you feel a vibration and see the Nothing logo appear. This force restart is quick and often solves the problem right away.

Review Your Microphone Permissions

Your voice assistant needs explicit permission to use your phone's microphone. Go to Settings > Privacy & security > Permission manager > Microphone. Look for the Google app (or whichever assistant app you use) and make sure it's set to "Allow only while using the app" or "Ask every time." If it's denied, that's your issue.

Also, check for any battery optimization settings that might be putting the assistant app to sleep. Go to Settings > Battery > Battery optimization. Find the app and set it to "Don't optimize."

Check for Physical Microphone Blockages

The CMF Phone 2 Pro has a clean design, but the microphone ports can still get clogged with lint from your pocket. Take a close look at the small grilles at the bottom of the phone and near the camera module.

Gently clean them with a soft, dry brush or a can of compressed air. Be careful not to push any debris further in. Also, if you're using one of the modular back accessories, make sure it's properly aligned and not covering any of the microphone openings.

Update Your Software

Running outdated software can lead to bugs that affect voice features. Nothing OS is pretty clean, but updates are important. Go to Settings > System > System update to check for any available updates for Nothing OS or Android.

While you're there, open the Google Play Store, tap your profile icon, and go to Manage apps & device > Updates available. Update the Google app and Google Assistant if they're listed. This ensures you have the latest voice recognition improvements.

Retrain Your Voice Model

If the assistant hears you but doesn't recognize your "Hey Google" command, you might need to retrain it. Background noise or just the way you say the phrase can change over time. Open the Google app, go to your Settings > Google Assistant > Hey Google & Voice Match.

Tap "Retrain voice model" and follow the prompts, speaking clearly in a quiet room. This process only takes a minute and can significantly improve accuracy.

Disable Battery Saver and Adaptive Features

Battery Saver mode restricts background processes to save power, which can prevent the "Hey Google" detection from working. Swipe down from the top of your screen twice to see the quick settings tiles and make sure Battery Saver is turned off.

Also, check if any other adaptive features are interfering. Go to Settings > Sound & vibration and look for settings like "Adaptive sound" or "Audio effects." Try turning them off temporarily to test if they're causing a conflict with the voice input.

Clear the Assistant App's Cache and Data

Corrupted temporary files can cause the app to malfunction. Go to Settings > Apps > See all apps. Find and tap on the "Google" app. Select Storage & cache.

Tap "Clear cache" first. This is safe and won't delete your personal data. If the problem persists, you can tap "Clear storage" or "Manage space" > "Clear all data." Just be aware this will reset the app and you'll need to sign back in and set up "Hey Google" again.

Check Your Network Connection

While many basic "Hey Google" commands are processed on the device, more complex queries that require a web search or smart home control need a solid internet connection. Make sure you're connected to Wi-Fi or have a strong mobile data signal.

You can test this by trying a simple on-device command like "Set an alarm for 5 PM" versus a web-based one like "What's the weather tomorrow?" If only the web-based ones fail, your network is likely the culprit.

Reset App Preferences or All Settings

If you've tried everything else, resetting app preferences can help. This resets permissions and default apps without touching your personal files. Go to Settings > System > Reset options > Reset app preferences.

As a last resort before considering a factory reset, you can try resetting all settings. This will revert Wi-Fi passwords, Bluetooth pairings, and system settings back to default, but your photos, apps, and messages will remain. You'll find this option in the same Reset options menu.

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