How to fix an iPhone X that has no sound, audio problems

If your iPhone has Bluetooth turned on or enabled, it's conceivable that it's now paired with or linked to a Bluetooth speaker or accessory, in which case its sound or audio outputs are directed to the other Bluetooth device. Simply switch off Bluetooth and listen to your iPhone's sound system to rule this out as a possible reason. Then here's what you should do:

1. To access the Settings app, tap it.
2. Toggle on Bluetooth.
3. Then, to toggle the function on or off, press the Bluetooth switch.
4. If Bluetooth is turned on, press the switch to turn it off.
5. After that, put your iPhone to the test.
6. Read more