Abstract: A method of anti-fraud for credit card applicable to a card-issuer to prevent an issued credit card from being cheated, with the method a cardholder may divide his Maximum Credit Line given by the card-issuer into a small predetermined amount over Internet and only release the small predetermined amount to his credit card for purchase usage successively, if credit card was stolen or a card fraud occurred, the cardholder could set his Operating Credit Line to zero over internet immediately, so that the cardholder's loss or the card-issuer's loss is minimized and the risk of being cheated is the lowest.

Abstract: The present invention disclosed a masked phone service, which depending on phone user's original phone number to virtually create multiple new corresponding substitutive phone numbers, called mask phone numbers; to mask phone user's original phone number when on demand; by adding this new created mask phone number, therefore, to make the phone user have at least two phone numbers on single phone device so that the phone user's original phone number and the mask phone number may be separately used for his working and private time respectively, and by this way the phone user's personal privacy is then improved.

Abstract: The present invention disclosed a masked phone service, which depending on phone user's original phone number to virtually create multiple new corresponding substitutive phone numbers, called mask phone numbers; to mask phone user's original phone number when on demand; by adding this new created mask phone number, therefore, to make the phone user have at least two phone numbers on single phone device so that the phone user's original phone number and the mask phone number may be separately used for his working and private time respectively, and by this way the phone user's personal privacy is then improved.

Abstract: The variant E-mail service is to combine three different common services (e-mail service, role playing game, matchmaking service) together as whole service on Internet to build variant E-mail service in cyber space with the function of “virtual friendship making” like playing with software game to provide an amusing service between users with fun and entertainment.