A、People can call you back if necessary. B、You can dial a special number free. C、You don’t need to pay for a long-distance call.

Phone books have white, blue and yellow pages. The white pages list people with phones by last name. The blue pages contain numbers of city services, government services, and public schools. Businesses and profession al services are listed in a special classified directory—the Yellow Pages.
    The area covered by one area code may be small or large. For example, New York City has one area code, but so does the whole state of Oregon. There is an area code map of the U. S. and Canada in the front of the white pages.
    Pay phones have numbers in the U. S. This means you can arrange to call a friend at a phone booth. Or if you are making a long distance call and run out of money, give the number on your phone to the person you’re talking to. Then hang up the receiver and they can call you back.
    If you make a long-distance call and get a wrong number, call the operator and explain what happened. This means that you can make the call again to the right number without having to pay more money; or you can have the phone company mail you a credit coupon that has the same value as the phone call.