When you play audio and there is no sound coming from your iPhone but an onscreen message showing your headphone volume despite the fact that no headphones are connected, your smartphone believes you are still connected to the headphones. This issue isn't uncommon, and it's usually simple to resolve.
If the iPhone headphone mode is activated even when no headphones are plugged in, you can resolve the problem by following these expert recommendations.

Plug and unplug the headphones

It's also possible that your phone is having technical difficulties. Simply plug in your headset and wait a few moments for your phone to recognize it. When you're done, slowly unplug the headphones. To make this method work, you may need to repeat the process a few times. Your phone will come out of headphone mode after doing this 2-3 times.

Restart your phone

If your phone has a software problem, you can quickly fix it by restarting it. Simply press and hold the Power (wake/sleep) button on your device until the power option appears. Slide it to the off position to switch off your device. Wait a few seconds before restarting your smartphone. It will allow you to quickly and easily fix an iPhone that has become stuck in headphone mode.

Clean your headphone jack

The presence of junk in the headphone/charger socket is one of the reasons your phone may become stuck in headphone mode. Even though you can't see anything in there, a small amount of dust might cause problems, so it's worth cleaning with compressed air even if you can't see anything.

Turn off Bluetooth

If you've been listening to music with Bluetooth headphones, your iPhone may believe that the headphones are still connected even after they've been turned off. Using the Control Panel or Settings app on your iPhone, disable Bluetooth.

Check for water damage

The headphone jack is one of the iPhone's most exposed parts, and it can be damaged unintentionally. If you enjoy running or exercising while listening to music, there's a good risk that sweat will get into the headphone jack and cause water damage. Even if it's in your pocket, too much humidity might cause damage to your phone.
To fix this problem, try draining your device and inspecting it for water damage. You may also keep it in a jar of unwashed rice or use silica gel dehumidifiers on the phone.

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