If you would like to add a field for the customer to apply their phone number follow the instructions below:
Step 1: Locate the product you want to add the phone number field to and access the product settings
Step 2: Inside the specific product settings, go to section 2(Checkout page)
Step 3: In section 2(Checkout page) locate the “Checkout Fields” and enable the “Billing Phone Number” then save. Optionally, you can make this field required if you want.
Now customers can enter a phone number while completing the product checkout.