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I don't think this works any more. My parents always did this when kids did prank calls. Kept the phone open for hours blocking their line. Did not work last time I tested. Uncertain how long you have to wait before next call though.


Generally with digital phone lines (almost every line out there) this does not work, and teardown on your side is at most few seconds.

This is also impossible to pull off on cellphone lines. (There are other attacks but these require access to your BTS.)


In the UK - it was only the person that calls you who could hold the line open. Looks like BT stopped this happening in 2014/2015

Read more about steps taken to prevent this here: https://www.mirror.co.uk/news/technology-science/technology/...




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