Abstract: A web conversion method based on phone calls is disclosed. Some embodiments comprise distributing a multiplicity of ads across a multiplicity of online media channels, displaying a unique advertiser phone number on each ad for a limited time every time a prospect visits a webpage hosting the ad, determining that the prospect called the advertiser phone number within the limited time, determining that the geographical zone of the prospect at the time of the call encompasses the geographical location of the IP address at where the unique phone number is displayed, and charging an advertiser for the ad that displayed the advertiser phone number.