Original iPhone 11 Pro Max earpiece:

Diagnosis justifying the change of your earpiece:

You can replace your earpiece if you have the following problems:

• You no longer hear or hear your caller badly during a call
• Earpiece sizzles during a call

CAUTION: an external speaker no longer working can also be due to a fault in the facetime camera because the iPhone earpiece works through contact made with the facetime camera.