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>rapidly pressing the prison phone's switchhook ten times (effectively pulse-dialing 0)

Eleven times; 1 was two clicks.



GP is correct. 1 has 1 click (at least in US where I grew up).

There are a few variations listed below, but none seem to use “extra” clicks.

https://en.wikipedia.org/wiki/Pulse_dialing


Swede here, the article even mentions Sweden as an exception having an extra click.




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