From 5G to 6G: Changes We'll Actually Feel

5G Didn't Live Up to the Hype

Korea launched the world's first commercial 5G network in 2019. It came with three promises: ultra-fast speeds, ultra-low latency, and massive connectivity. Seven years later, honestly, how much of that have you actually felt?

Beyond YouTube loading a bit faster, I can't point to a meaningful difference from 4G. People I ask give similar answers: "I don't even know if I'm on 5G."

There are about 37 million 5G subscribers, but actual 5G coverage is concentrated in urban centers. In the subway, it still frequently drops to LTE, and there are weak spots inside buildings.

Why It Fell Short

The theoretical peak 5G speed is 20Gbps, but real-world measurements come in at about 500Mbps-1Gbps. That's roughly 5% of the theoretical maximum. This gap is the main reason it doesn't feel different.

But from what I can see, 5G's failure isn't really about speed -- it's the absence of a killer app. VR streaming, remote surgery, autonomous V2X communication. The services that truly need 5G haven't reached mainstream adoption.

When LTE can already handle 4K YouTube, why do you need 5G? We've been unable to clearly answer that question for seven years. (I can't help but think the carriers' marketing budgets were somewhat wasted.)

What's Different About 6G?

6G standardization discussions began in 2025, with a commercialization target of 2030. Theoretical peak speed: 1Tbps -- 50x faster than 5G.

Three differentiators:

Terahertz frequency bands. Higher frequencies allow more data transmission but reduce signal range. This means base stations need to be installed more densely.

AI-native design. 6G integrates AI into network management from the ground up. Traffic prediction, frequency allocation, and fault detection will be handled automatically by AI.

Spatial computing support. The goal is real-time streaming of AR/VR content with ultra-low latency. If device-side computation can be offloaded to the cloud with only results streamed back, devices can become much lighter.

The Bigger Problem

The infrastructure investment costs are astronomical. Korea's three major carriers invested about 30 trillion won in 5G infrastructure. They haven't even recouped that investment, and now they need to start investing in 6G.

Since they couldn't make money on 5G, they'll naturally be conservative about 6G investment. ARPU (average revenue per user) didn't meaningfully increase after 5G adoption because consumers weren't willing to pay more for 5G.

6G could face the same problem. If consumers answer "No" to "would you pay an extra 10,000 won per month for this?" the investment motivation evaporates.

What Changes Matter for Developers

From a developer's perspective, 6G means you can be bolder about designing with network availability as a given.

When edge computing goes mainstream, devices won't need to handle heavy computation. This could fundamentally change mobile app design philosophy. From "it has to work offline" to "it's always connected."

But they said the same thing about 5G. That we'd always be connected. The reality is that it drops in the subway, in elevators, and in parking garages. Whether 6G will solve this remains somewhat doubtful.

Will It Really Arrive by 2030?

If the ITU timeline holds, commercialization comes in 2030. But 5G also slipped 1-2 years from initial schedules. If 6G slips similarly, 2032 seems more realistic.

And even when it launches, you won't feel it immediately. Just like 5G launched in 2019 and still feels indistinguishable seven years later. The point where 6G actually changes daily life is probably after 2035. But then again, technology predictions seem to exist mainly to be wrong.