I have a client that is requiring EITHER a phone number OR email in exchange for some valuable whitepapers. Has anyone experimented with conditional validation that requires one of the two fields?
I wonder how to even inform users that we need one or the other. I could just as easily require email and make phone optional if this is a bad idea. My only thought is that users who would rather receive a phone call might not want to provide their email address and abandon the form.