Year 73 (LXXIII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Domitianus and Catullus (or, less frequently, year 826 Ab urbe condita). The denomination 73 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Call forwarding (or call diversion), in telephony, is a feature on some telephone networks allowing an incoming call to a called party to be redirected to a third party. For example, the third party may be a mobile telephone, voicemail box or other telephone number where the desired called party is situated. It was invented by Ernest J. Bonanno. In North America, the forwarded line usually (though not always) rings once to remind the customer using Call forwarding that the call is being redirected. More consistently, the forwarded line indicates its condition by stutter dial tone. Call Forwarding lets you forward incoming calls to your home number to another telephone number. The number can be anywhere in the U.S., though you will pay any long distance charges for forwarded calls outside your local calling area. To activate Call Forwarding, dial #72 followed by the telephone number to forward calls to. Once someone answers, Call Forwarding is in effect. If no one answers or the line is busy, hang up and dial #72 followed by the same telephone number, and Call Forwarding will then be in effect. To turn off Call Forwarding, dial #73. This feature requires a subscription from your local telephone company. Also available in some areas is Remote Access to Call Forwarding, which lets you turn Call Forwarding on and off from telephones other than your home phone.