Remove primary number from contact?

[WillJitsu]

I have assigned a primary number to a contact and I want to remove that without anything another primary number. I can only find a way to assign another number as primary. Is this possible?

 

[WillJitsu]

Just for clarification... I want the contact to keep both numbers, but I do not want either number to be designated as a "primary" number. That way, when I click on the dial icon from the person shortcut on my home screen, it prompts me for which number I want to dial. Anyone know how to remove the "primary" setting from a number? Thanks!