The thing with Google Analytics is that you can only define 20 goals. It is definitely not enough when I want to create multiple landing pages with preset WhatsApp contact button.
Category = outbound
Action = click
Label (begin with) [http://domain]
Value > [empty]
Before this I used to define goal for each button that have different preset message. Now I discovered that you can create a single goal that will track all outbound click to addresses that begin with a certain string. Combined that with the ability to see conversion happen at which page, this works well for me!