Perform inspection and repair, clean the headphone jack or replace the headset.

1. Carry out inspection and repair: The handset or speaker of the mobile phone is malfunctioning, causing it to sound simultaneously. In this case, you need to go to Apple’s official after-sales service center for inspection and repair.

2. Clean the headphone jack or replace the headset: If the headset is plugged into the phone but the headphone jack is faulty, it will also cause the earpiece and speaker to sound at the same time. This can be solved by cleaning the headphone jack or replacing the headset.