How to add additional field in Global Address book

[Hasher]

Besides what the default view of address book which is:
Name, Business Phone, Office, Title, Company, Alias, Email Type, Email
Address.

How can I add additional filed such as Mobile phone in the address book.

Any help is appreciated.

 

[Brian Tillman]

Besides what the default view of address book which is:
Name, Business Phone, Office, Title, Company, Alias, Email Type, Email
Address.

How can I add additional filed such as Mobile phone in the address
book.

The address book is not customizable.