The Secret World of Phone Hackers
Like Duolingo, but for The Secret World of Phone Hackers. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
A deep dive: 88 levels across 5 sections, about 176 minutes end to end, roughly 35 days at five minutes a day. It moves through The Magic of the Telephone Network, The Toy Whistle That Changed Everything, Building the Famous Little Boxes, The Culture of the Underground, and The Law and the End of an Era. It starts from scratch.
Free forever · No credit card · iPhone & Android
Key ideas in The Secret World of Phone Hackers
- Calls originate at a local exchange
- Strowger switches moved physically based on pulses
- Long-distance calls are routed up to regional hubs
- Crossbar switches used a matrix to connect lines
- Automated switches handled the physical connection of digits
- Circuit switching requires a dedicated physical path
- The physical sequence of a call through the network hierarchy
- Operators were needed for billing, person-to-person calls, and troubleshooting
- If all trunks are full, no more calls can be placed
- The function of mechanical components in a phone exchange
- The role of the operator versus automated switching
- The physical limitations of circuit-switched networks
- Long-distance lines (trunks) were a finite physical resource
- Maintenance of transcontinental copper infrastructure was costly
- Electrical pulses were sent down the line
- Electromagnets moved a metal wiper arm up and across a bank of contacts
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The Secret World of Phone Hackers the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Picture this: you lift your heavy rotary receiver in 1960. Where does your phone line physically end up to start its journey?
Get it right to open this lesson and 87 more in the app.
Where The Secret World of Phone Hackers takes you
Travel back to a time when the world's phone lines were a giant playground. Discover how early hackers used plastic whistles and homemade boxes to explore the global network for free.
- 1
The Magic of the Telephone Network
- How Calls Used to Travel
- The Secret Language of Tones
- Why the System Was Vulnerable
- The People Who Found the Holes
- 2
The Toy Whistle That Changed Everything
- The 2600 Hertz Discovery
- Captain Crunch and His Cereal Prize
- Tricking the Long Distance Lines
- The Blind Kids with Perfect Pitch
- Exploring the Tandem Switches
- The Joy of Free Long Distance
- 3
Building the Famous Little Boxes
- The Blue Box: Taking Control
- The Red Box: Faking Coins
- The Black Box: Receiving Free Calls
- 4
The Culture of the Underground
- Meeting on Secret Party Lines
- The First Hacker Magazines
- How Steve Jobs and Wozniak Started
- The Ethics of the Phone Phreaks
- The Most Famous Pranks Ever Pulled
- 5
The Law and the End of an Era
- The Phone Company Fights Back
- The FBI Gets Involved
- Moving from Tones to Computers
- The Legacy of the Golden Age
5 sections · 22 units · 88 levels. Built to play, not to enroll.
You pick the voice
The Secret World of Phone Hackers is taught in the The Storyteller style: every lesson is a story. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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Start The Secret World of Phone Hackers today.
Download Tomo, search The Secret World of Phone Hackers, and play your first lesson in under a minute.