I can not hear the caller when answering the phone. What could be the issue

If you have followed all the steps and instructions in Related Article: If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker and if you still need help, get more help and assistant from Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK) 

Shawneelane ~ Does your iPhone 11 Pro Max still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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