Although users are generally not liable for fraudulent calls, it can be very frustrating to argue about charges with the carrier. In many cases, only the account number is stolen. To avoid this kind of theft, try to block the phone when entering your account number. In addition, make sure to disconnect from the carrier before leaving the phone. Otherwise, the next user can continue to charge calls to your card.
Toll restriction allows a company to block calls to certain area codes or dialing exchanges.
This minimizes your exposure to theft by denying thieves the ability to reach 900 numbers or overseas locations. Pricing Calling cards cost more to administer than standard long distance service, and thus cost more. However, many cards are radically overpriced. Cards with an access charge typically bill 20 to 35 per minute, plus an access surcharge of 35 to 65 . Cards without an access charge typically bill 30 to 40 per minute.