The telephone turns 150

150 years on, Alexander Graham Bell's genius still powers our mobile world.

(first published on my substack )

Air – metal – ear. The genius that changed the world.

Today, the telephone turns 150. On 10 March 1876, a 29‑year‑old teacher of the deaf named Alexander Graham Bell shouted in frustration, and the future answered.

Call waiting.

Bell wasn’t alone in chasing the dream. Don’t get me wrong, Morse code rocked, but for decades inventors had tried to get more than dots and dashes down a wire.

Italian‑American engineer Antonio Meucci showed off a “teletrofono” in the 1850s, and others had built experimental voice telegraphs.

But it was Bell who fashioned the first system that reliably replicated speech.

On 7 March 1876, the US Patent Office granted him rights to an “apparatus for transmitting vocal or other sounds telegraphically,” and the telephone era clicked into place.

Did Bell really drop acid?

The first famous call wasn’t exactly “four score and seven years ago” or “one small step for man” vibes. In Bell’s lab notes, he simply shouts, “Mr Watson, come here, I want to see you!” into his new transmitter, and Watson hears him clearly in the next room.

Urban legend later added a slapstick twist. Today many people believe Bell spilled battery acid on himself and then shouted to Watson for assistance.

I so wish that were true, mainly because I love the idea that the very first phone call could have been “F**k me that stings”.

How does a phone actually work?

Anyway, back in 1876 it was incredible to imagine that Bell could shout in his lab and be heard in the next room. This was his genius.

Of course when we speak into an old‑fashioned phone, “words” don’t leave our mouths as bite‑sized chunks, crawl down the phone line and enter someone’s ear.

What actually happens is this. Your voice makes the air wobble, and that wobble pushes and pulls a tiny metal disc in the handset. The disc’s movements squeeze and relax miniscule carbon grains, creating an incredibly sensitive electrical wobble – a changing current that varies in perfect time with your voice.

That changing current races down the wire. At the other end, another little metal disc feels that electrical wobble and vibrates in exactly the same pattern, wiggling the air next to your friend’s head so their brain hears your voice.

No words travel as such. But just air and metal and electricity do a perfect little dance.

Amazingly, the mobiles of today still lean on Bell’s genius. Your phone samples your voice, turns it into ones and zeroes, beams it to a tower (and maybe a satellite or two), then back to another handset where it’s unpacked.

But the first and last steps are still the same: air, metal, ear.

Fair to say, it caught on!

How big a deal was that moment?

Historians and economists routinely sling the telephone into the same tiny club as electricity, the steam engine and the internet. The general‑purpose technologies that rewire everything from business and politics to journalism and family life.

Fast‑forward to now. We make an estimated 13.5 billion phone calls every day on mobile phones alone – roughly 150,000 calls a second.

The slab in your pocket has more computing power than the top supercomputers of the 1990s. Today that same device runs maps, banking, cameras, games and, theoretically, also makes phone calls.

Though if your household is anything like mine, the kids use it for everything except talking.

… but it wasn’t instant.

For a technology that “changed the world”, the rollout was anything but instant. Bell’s patent landed in 1876, but in many countries household telephone penetration didn’t cross 50 per cent until well into the mid‑20th century, held back by the cost of copper, exchanges and operators.

Electricity followed a similar arc. From the first city power stations in the 1880s to a majority of homes being wired up took 40–50 years in places like the US and Europe, much longer elsewhere, and in some places it’s still a pipe dream.

Up close, transformative tech feels slow and patchy; in hindsight it looks like a jump cut.

It’s 2026. We have to talk AI!

Which brings us to artificial intelligence. People see chatbots and image generators and assume we’re about to get a world‑changing “phone call moment” every week.

Maybe.

But if the telephone and electricity are any guide, the real action isn’t the viral demo, it’s the boring decades of wiring the world. This involves building infrastructure, enacting regulation, combatting organisational inertia, wrestling with costs.

The gap between “Mr Watson, come here” and everyone having a handset was measured in generations, not news cycles.

Some argue the AI revolution will cut wider and deeper than any before it. But if AI really is in the same league as electricity and the phone, we might still be much closer to that messy Bell‑in‑the‑lab phase than the moment when your mum can’t remember how she ever lived without it.

Which reminds me … I’ve gotta call my mum!

Hey I'm now also on substack.