With so many phone numbers in North America... the number of sequences is limitless So, if you have been trying to find a particular telephone number that starts with a 443-647 area code exchange, you can. Thanks to reverselookupphonedirectory.com, all you are required to do to get information on someone with a 443-647 is type in the entire nine digit telephone numberr into the provided search box. That is all you need to begin your query. The days of looking for background information from multiple sources are over.