Siri not recognizing any voice input, unless earphones are plugged in

Hello RDCarp,

Thank you for using Apple Support Communities.

I see that Siri isn't recognizing your voice commands. I would suggest the following troubleshooting:

Get help with Siri

• If "Hey Siri" isn't working, make sure that "Hey Siri" is turned on under Settings > General > Siri.
• Siri might say, "Sorry, I'm having trouble connecting to the network," or "Try again in a little while." This is probably a network issue. Check your Internet connection and try again later.
• When you're using Siri to dictate, dictation is limited to about 30 seconds.

If Siri isn't available, or doesn't understand or respond to questions

Before you try these steps, make sure that your device works with Siri. After each step, see if Siri is working.

1. Make sure that your iOS device has an Internet connection through Wi-Fi or cellular data.
2. On your iOS device, make sure that Siri is turned on under Settings > General > Siri.
3. Restart your iPhone, iPad, or iPod touch.
4. On your iOS device, go to Settings > General > Siri and turn off Siri. Then turn it on again.
5. If you're using an iOS device, try to use Siri with a headset. If Siri only works when you're using a headset, get help with the microphones on your device.
6. Contact Apple Support.

If Siri doesn't make a sound when you hold down the Home button

On your iPad or iPod touch, Siri will chime when it's time to ask a question. If you have an iPhone with iOS 9 or later, Siri will vibrate instead. You'll only hear the chime on your iPhone with iOS 9 or later when you're using headphones.

Siri will also chime when you use "Hey Siri" on a device with iOS 9.

From this support article: Use Siri on your iPhone, iPad, or iPod touch

Best regards.