How to Fix No Phone Audio on iPhone and Android

howtogeek.com:

Can't hear any sound from your phone? Problems like malfunctioning headphones, your phone using a wireless device for audio output, sound being muted within a particular app, interference from other installed apps, and more could be causing this issue. We have some solutions you can try to resolve this problem.

Perform Some Preliminary Checks

Start the troubleshooting process by performing basic checks to ensure a temporary hiccup isn't affecting the sound. You can try restarting your iPhone or Android phone, turn off silent or do not disturb mode, and clear any dust or obstructions from the speakers. Also, check that neither your hand nor your phone's cover is blocking the speaker, which could cause a muffled sound.

If you're using headphones, disconnect them and clean the 3.5mm headphone jack or USB-C port. Using your phone with very low battery levels can sometimes cause unexpected issues, so consider charging your phone if the battery is too low. If the problem persists after these basic checks, you can try the solutions below.

Unpair Wireless Audio Output Device on Your Phone

If you use wireless Bluetooth headphones or speakers with your phone, ensure they're not currently connected to your device and that your device isn't using them as the audio output device. To check this, you can simply disable Bluetooth on your Android phone or iPhone, causing any connected devices to disconnect automatically.

If disabling Bluetooth fixes the problem, you must unpair the paired audio output device. On Android, swipe down from the top of the screen and long-press on the Bluetooth icon until a menu displaying your paired devices appears. Tap "Details" to open Bluetooth settings. Then, tap the gear icon next to the device you want to unpair.

Select "Unpair" and confirm by tapping "Unpair."

If you have an iPhone, swipe down and long-press on the Bluetooth icon, then tap "Bluetooth Settings." After that, tap the information symbol (ⓘ) next to the device you want to unpair.