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How the first ever telecoms scam worked

Tom Scott | April 1, 2026



In the 1830s, two French brothers, François and Joseph Blanc, pulled off the first telecoms scam in history. The optical telegraph, a line of semaphore towers stretching from hilltop to hilltop, was for government use only: but something as simple as the law wasn’t going to get in their way.

Thanks to Victoria Harrison for all her research and translation skills! Pictures of the original documents are uploaded here: https://drive.google.com/drive/folders/1xik-sJZMUf9GRNCAu7m7amQMZ7Mos1HM?usp=sharing

CG effects by Mat Hill: http://mat-hill.xyz/

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Written by Tom Scott

Comments

This post currently has 21 comments.

  1. @TomScottGo

    April 1, 2026 at 7:38 am

    Quick tip if you ever go to France: don't let the rental car company give you a free upgrade to an SUV. SUVs do not fit well on tiny rural French roads.

  2. @fp6343

    April 1, 2026 at 7:38 am

    4:30 Telegraph managers, who checked the signals at important cities would have prevented the codes that broke the Clacks towers to be sent all the way down the line. A section of the network could have been disabled, for example between Überwald and Genua, but the communication between Ankh Morpork and Überwald could have continued uninterrupted.

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