I can't see phone number saved in my address book. I only see his name

Hello,

I can't find a solution through which I can see at the same time the name and phone number in the phone function (for contacts in the phonebook)

For example, when a customer calls me and I talk to him, I can't see his phone number saved in my address book. I only see his name.

This can help me a lot to find the database on the PC.

iphone 8 IOS 13.5.1

I can also buy an application to do this, but I can't find it.

Thank you,

​[Re-Titled by Moderator]