Telephone or mobile field in address

Please add Mobile field in address. I understand we can use custom fields. But this is something that should be present in address table so that it can be used in address format for shipping labels. This is one of the most required custom work we see. Also with adding this field in address, please do not remove it from account field. As many clients are using login based on mobile instead of email. One possible solution is when a customer adds a new address, it should prefill the form with account firstname, last name and telephone. And customer can change it if required. But most of the times it is same as account details so it'll give a better experience.