I followed the instructions on the International Support page.
I found two landlines and called
1) Country Code
2) Toll-Free Access #
3) Country Code + Toll-Free Access #
All three options failed.

The closest thing to a connection I got was through the "Country Code." I heard a very loud and beep, which was repeated several times, until it ended with a perpetual beeeeeep. I input the Verizon Wireless calling card number 9085594899 and PIN 2392 throughout the repeated beeps and the permanent beeeeeep. It did not work.