The problem of sound coming out of the earpiece of an Apple phone may be caused by many reasons. Here are some possible solutions:

1. Adjust the volume. Make sure the volume is set correctly and the sound is coming from the speaker (earpiece).

2. Check the headphone jack. If you have used headphones before, there may be dust or debris accumulated in the headphone jack. Turn off the phone and disconnect it from the power source. Use a toothpick or a small cotton swab to gently clean the headphone jack.

3. Check whether the headphones are inserted correctly. Make sure the headset is inserted correctly and the earpiece is not inserted by mistake.

4. Check the phone settings. Check the volume settings in Control Center to make sure the sound output is set to "Headset."

5. Restart the phone. Try restarting your phone, which can sometimes resolve temporary software issues.

6. Update mobile phone software. If the problem persists, you can try updating the iOS system.

7. Restore factory settings. If you suspect a software problem, you can try a factory reset.

8. Check the hardware. If none of the above methods can solve the problem, it may be that the hardware device is faulty. It is recommended to go to an Apple store for inspection and treatment.

9. In addition, if the earpiece is clogged, you can use a toothbrush with a little water or detergent to gently clean the earpiece net, brush it several times until it is clean, and then blow dry with a hair dryer.