How can I remove the billing phone number from checkout, or at least make it not required?
I've looked everywhere and can't find any references to the form.
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I'm not sure about previous versions but in Magento 2.2 you can go to
Store > Configuration > CUSTOMERS > Customer Configuration
Then go to the Name and Address Options tab on the right and look for Show Telephone and select your option. (No) (Optional) (Required)
It's set to Required by default.