If you're over a certain age and live in the USA you may remember the days when giant books filled with addresses and phone numbers were thrown at your house each year by Ma Bell. Unlike countries elsewhere, such as France, where computers took over the task of finding phone numbers before cell phones were popular, the White Pages (and their paid cousin, the Yellow Pages) were a fixture of American life for many years.
Of course, now we have smartphones. But if someone isn't in your address book on your iPhone, you can use the WhitePages app to find their info. The WhitePages app does more than reverse lookup, but don't take my word for it. Check out the demo video below to see it in action.