How to get a telephone number from the Default Adress also shown in Customer Overview

[Yourdecoration]

Hello,

We are using Gorgias and Gorgias is able to search orders/tickets on basis of telephonenumber. Which is great.
But Gorgias is expecting this number to be in Customer Overview... but al our telephonenumbers are in Default Adress and not in the Customer Overview where Gorgias is looking

Is there a way to fill the telephone number by Customer Overview also? For new orders would be nice.
Better is to have al the telephone numbers in our Shopify bij Default Address AND by Customer Overview

Kind regards,
Maurice