(1) If you don't know who your long distance carrier is, call 1-700-555-4141.
(2) Want to know the number you're calling from? There are dozens (or hundreds) of different codes. Verizon has used 990, 990-1111 and 958. SBC-SNET used 970#, but it changed to 959-9822 after the AT&T takeover.
(3) 800 444-444 provides number announcements, but maybe only for MCI customers.
(4) If you need a test fax sent to you, call Brother at 1-800-521-2846.