The volume of my iPhone 7 Plus calls is very low

Hello ~ Take a look here by clicking on and reviewing the information there…

If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker - Apple Support

If nothings there help s out you make need to have your device checked out…

Genius Bar Reservation and Apple Support Options - Apple

I hope this helps.

~Katana-San~

747122 ~ Does your iPhone 7 Plus still have its original battery?

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

Settings > Battery > Battery Health

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