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If presented with an old 2000 era landline phone, I can call someone by rapidly hanging up in the pattern of their phone number.
In case anyone is wondering, this is how old phones with rotary dials worked: you wound the dial to the digit you needed and the built-in mechanism would automatically wind it back; as it did it would momentarily disconnect the line as it passed each digit generating pulses that the exchange would count. If you still live somewhere where landline phones exist odds are this still works because the exchange maintains backwards compatibility with pulse dialling.
Up until about twenty years ago virtually every supermarket had a phone by the checkouts with a single pre-programmed button for a local taxi company; we used this trick all the time to call home, our mates, etc.
You're welcome to dial into my Modem on which Doom is listening for a connection at 40c3 :3
Used to do this in payphones as a kid. The numpads were disabled when no coins were inserted, effectively disabling tone dialing. But pulse dialing still worked.
I am pretty sure I could do it sans phone and only the handle, by rapidly pulling the plug out of the socket and putting it back in.
Never thought to try it when I had the chance.
Often the rj-12 handset cabling would not plug directly into the rj-11 jacks. If they did, I'd be surprised to learn they'd work on the wire as-is.
Yeah, you'd have to change the plug.