has failed and suggests how to proceed step 136 once registered registrant may choose to edit their registration information referring to fig2 a registrant for example can edit their listing to hide part of their phone number or address for example the phone number may be replaced by alphabetic characters so that it can be used in an url string to bookmark their listing to do this the registrant replaces some or all of the digits of the phone number with alphabetic characters step 150 the system then determines if the alphabetic characters chosen are already in use by someone else step 152 next the user may modify or remove the street address step 154 and determine whether this street address is to be published step 156 if the information is publishable the database is updated step 158 if the information is not to be published a do not publish flag attached to the information is set step 160 indicating the information is not to be published and then the database is updated step 158 the application provider further may take measures to prevent caller id spoofing caller id spoofing is a service that allows a caller to masquerade as someone else by falsifying the number that appears on the recipient 39 s caller id display caller id spoofing can make a call appear to come from any phone number the caller wishes several service providers offer caller id spoofing including camophone spooftel and pi phone to use camophone 39 s service a customer.