Digits: Merge Phone Number Theme
Digits: Merge Phone Number Theme plugin merges both of these fields for the signup process during checkout. Since digits are fully compatible with WooCommerce, which means we even support their checkout signup functionality, and to make it work we have to add a Mobile Number field in checkout and WooCommerce already has its Merge Phone Number Theme field in the checkout.
This will only merge the Billing Phone Field and Mobile Phone fields when the checkout is accessed without logged in and signup is processed, it will feed the Mobile Phone data to Billing Phone Field for that particular order. For all subsequent orders, your users will see Billing Phone Field on checkout.
The setting for this addon only contains one option to enable or disable it.
When enabled this will reflect changes on the WooCommerce checkout page by merging the Merge Phone Number Theme field and Account Mobile Number (digits field) when the user is not logged in or in the case of signup process at checkout, in this case billing phone number will be fed the data from account mobile number (digits field) for that particular order. For all consecutive logged-in orders users will get an option to change their billing phone number.
Merge Phone Number Theme Features:
Merge Billing Phone and Account Phone at checkout.
The user will be able to change billing phone from subsequent orders.