Adding a Phone Number to a Client Record
The easiest way to add a phone number field is to use Sprout Clients. Sprout Clients integrates well with Sprout Invoices and includes the ability to add a phone number for each user.
If you need something more advanced than you may want to consider one of these options:- Adding a custom field via a filter/add-on
- Here's a doc that will help you do this: Adding a Client Custom Field
- Using Advanced Custom Fields
- You can also use ACF if you want to add more than one new field - https://www.advancedcustomfields.com