• Are you a casual telephone user, or are you the kind of person who gets excited when someone mentions No. 5 ESS? Do you just have one cordless phone for your whole apartment, or do you have five phones hooked up in every room? Whether you're drooling already or whether you have no idea what any of this is about, take this test and find out just how much you really know about telephones. (This test might be considerably harder if you don't live in the United States or Canada)