E-911 Registration
Dial 933 from your phone and you will hear a recording stating your registration status and e911 number displayed.

US/CAN Dialing, Call Quality and Latency
Note that these are not owned numbers and are subject to change.

https://shaun.net/resources/test-phone-numbers

International Dialing
Dial 01161291920995 . The Melbourne, Australia time and weather Auto Attendant should answer. Please note that international rates will apply to the call.

Dial 011 44 207 499 9000. The US Embassy in London will answer with an automated answering machine.

Fax
Send a fax to 1888-473-2963 or 215-825-8792. These fax servers will send a fax back to the fax number you sent the fax from.