caller ID

noun2

1. •
   The telephone number and/or name of the originator of an incoming telephone call, displayed on the screen of the telephone or other electronic device receiving the call.

   • I've been trying out some of the new watches that display caller IDs, text messages, Twitter and news feeds, and the weather, too. — 2012
2. •
   The service of providing such information, sometimes included in one's standard telephone contract and sometimes available for an extra fee.

   • The new phone service known as Caller I.D. is a double-edged sword: it protects the privacy of some people, but at the expense of others. — 1991