I knew a guy who could (controllably!) whistle _modulated_ Bell-103 'originate' tones. I mean well enough to negotiate login/password prompts, get the MOTD, and find out if he had "new" mail, *without* anything other than a handset. (he _wasn't_ good enough to tell what the MOTD said, 'by ear', but he could tell the difference between 'You have mail', and 'You have new mail'.)
I could whistle a recognizable Bell-202 carrier, but with just noise as the modulation.`