Why won't Siri respond to voice commands on an iPhone?
Answer
This is usually caused by a Siri toggle being switched off, a Screen Time restriction blocking Siri, or the 'Hey Siri' voice recognition needing to be set up again. Checking each setting in order usually finds the cause.
Follow these steps
Confirm the main Siri toggles are on
Go to Settings > Apple Intelligence & Siri (labeled Siri & Search on some versions) and confirm both the voice-activation toggle and the button-activation toggle are turned on.
You should see: Both toggles show as enabled in the Siri settings screen.
Toggle Siri off, restart, then turn it back on
Turn off the voice-activation toggle, restart the iPhone completely, then return to the same setting and turn it back on.
You should see: The setting saves correctly and Siri is available again after the restart.
Check Screen Time restrictions
Go to Settings > Screen Time > Content & Privacy Restrictions, and confirm Siri (sometimes listed under Intelligence & Siri) is allowed, not restricted.
You should see: Siri shows as allowed under content restrictions, or you find and correct a restriction that was blocking it.
Turn off voice activation, then set it up again
In the Siri settings, turn off "Listen for 'Siri'" (or "Hey Siri"), wait a moment, then turn it back on and complete the voice recognition setup prompts again.
You should see: The setup process completes and the phone confirms it recognizes your voice.
Test the microphone separately
Open the Voice Memos app and record a short clip to confirm the microphone itself picks up sound clearly.
You should see: The recording plays back with clear audio, ruling out a hardware microphone issue.
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Extra tips
What to look for: Siri not activating from a voice phrase or button press, an error tone instead of a response, or the Siri setup screen reappearing unexpectedly.
Before you change anything: Confirm you're checking Settings > Apple Intelligence & Siri (this may be labeled differently on older iOS versions). Check whether Screen Time or parental controls are active on the device. Test the microphone in another app, such as Voice Memos, before assuming Siri itself is broken. Note the exact iOS version, since menu names can shift between updates.