The easiest way to find out whether your Yellow Pages directory or Yell online advertising isworking for your business is to count the number of calls your adverts generate. Here at Yell we understand that it's not always possible to ask every customer you speak to where they got your number from; This is where Call Counter comes in - and it's free1.
Example of how your Call Counter data is displayed:

Give our customer service team a call on 0800 555 444 or speak to your Yell sales contact.
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Yell knows that every pound you invest needs to give you back a good return and we’re so confident in the value that Yellow Pages and Yell.com delivers we simply want to prove that to you.