What is 5G?

Think of a road being rebuilt. The old road had two lanes and everyone used them for everything. Lorries, buses, boda bodas and ambulances all crawled along together. The new road has more lanes, a fast lane, and a lane kept clear for emergencies.

That is roughly what 5G did to mobile networks. It is the fifth generation of mobile network technology, and it replaced 4G as the standard for phones and connected machines.

5G was designed to do three things better than 4G. Carry more data at once. Reply faster. Support far more devices in the same place. However, very few uses need all three at the same time, which is why 5G looks different from one country to the next.

What the generations actually were

Each generation solved the problem of its day. The first carried voice, in analogue form, and the second made calls digital and added text messages. The third brought the mobile internet, slowly, and the fourth made video on a phone normal.

The fifth is aimed less at your phone and more at everything else. Sensors, cameras, machines, vehicles and meters. That is the shift worth remembering.

Every generation is agreed in advance by a global standards body, so a phone bought in one country works in another. That agreement is why the letter G means something at all.

How 5G works, in plain terms

A phone talks to a mast by radio. Radio waves come in bands, and a band is a range of frequencies. 5G uses three groups of bands, and they behave very differently.

• Low bands, below about one gigahertz. These travel far and pass through walls, and they are only a little faster than 4G.
• Mid bands, around three to four gigahertz. These are the workhorse of most 5G networks, with a good balance of speed and reach.
• High bands, above twenty four gigahertz, often called millimetre wave. These are very fast over short distances, and they are blocked by walls, rain and even a hand.

Therefore, the 5G you meet depends entirely on which band your operator uses. A network on low band feels much like good 4G. A network on high band can be extremely fast in a stadium and useless one street away.

What it is good at

Speed is the obvious gain. In everyday use a good mid band 5G connection often delivers a few hundred megabits per second. That is several times a typical 4G connection.

The reply time also improved, and the gap between asking and being answered is called network latency. A 5G link usually answers faster than a 4G one. The standard was written to allow very short delays where an operator builds for it.

The third gain is crowds, because 5G can hold far more devices per mast than 4G. That is what makes a market, a stadium or a street of smart meters workable.

The fourth is control. 5G lets an operator split one network into separate virtual networks with different guarantees. That trick is called network slicing, and it is how an ambulance service can be promised capacity that a video app cannot take.

What it is bad at

5G needs many more masts than 4G, especially on the higher bands. Masts need power, fibre and permission. That is slow and costly everywhere, and it is why coverage maps have so many holes.

Indoor coverage is the common disappointment, because high band signal barely gets through a wall or a modern window.

Cost is the third problem. Operators paid a great deal for the airwaves and the equipment, so handsets and data plans carry some of that.

And much early 5G was built on top of existing 4G equipment, which limits the gains. Engineers call the full version standalone 5G, and only there do the best reply times become possible.

Where you already meet 5G

Mostly on your phone, where it shows as a small label near the signal bars. That label tells you the radio in use, not the speed you will get.

You also meet it as home broadband. In many places a 5G box in a window is the fastest internet available, because no cable has to be dug to the house. Where fibre and 5G both fail, people fall back on satellite internet.

Industry is the quieter story. Factories, ports and mines build private 5G networks to move cameras and machines without cables. However, in those settings the reliability matters more than the headline speed.

Common worries, answered plainly

Does 5G harm your health? The radio waves used by mobile networks are non ionising. That means they do not carry enough energy to break the bonds inside your cells. National limits on exposure exist and networks are built to stay well inside them.

Will 5G drain your battery? It can, especially where the signal is weak and the phone works harder to hold a link. Therefore, switching a phone to 4G in a weak area often saves power.

Do you need a new phone? Yes. A 4G phone cannot use 5G, because the radio hardware is different.

What is coming next

Two things. Operators are still upgrading to standalone 5G, which improves reply times and makes slicing practical. And attention is already moving to the next generation. It is worth understanding what 6G is and when it is coming, before anybody tries to sell it to you.

Expect the same pattern as before. The first year is marketing, and the useful version arrives when coverage is ordinary and the price is not.

What to check on your own connection

Run a speed test on your phone in the place you use it most. Note the download speed and the reply time, which a test app usually calls ping or latency.

Then repeat it indoors and outdoors, and again at a busy hour. Compare the three results. If the reply time is good but the speed is poor, the mast is crowded. If both are poor indoors and fine outside, the band is being blocked by the building. THE NUMBER ON THE SIGNAL BAR IS NOT THE NUMBER THAT MATTERS.

Just Out Tech explains new research in plain language. This article was drafted with AI assistance and checked by a human against the original source.