With so many numbers nationwide... the number of combonations is unmeasurable So, if you've been searching for a specific phone number that starts with a 707-678 area code exchange, you are now able to. With the help of reverselookupphonedirectory.com, all you are required to do to get information on someone with a 707-678 is enter their complete nine digit phone numberr into the available search box. That is all you need to begin your query. The days of looking for background information from different sources are over.