Abstract: A system and a method are disclosed for providing telephone number sharing services to subscribers over public switched telephone network or data network. The disclosed system first receives call details of a call from a subscriber of the system. The call details include reusable call number preference of the subscriber as well as a phone number of a called party. The system stores the call details in a database. The system determines whether the received call from the subscriber is a first call to the called number. In response to the call being the first call to the called party, the system assigns a reusable call number that satisfies the reusable call number preference of the subscriber, and forwards the call to the called number with the reusable call number.