The short answer
5G is the fifth generation of mobile network technology, the successor to 4G LTE. It was first deployed commercially in 2019, and its technical standards are developed by the 3rd Generation Partnership Project, known as 3GPP. In plain terms, 5G is a new way for your phone to talk to the network: it can move data faster, respond more quickly, and handle far more connected devices in the same area than 4G could. That is the promise. The reality depends on where you live, which phone you own, and which plan you are on — because not all 5G is the same.
What 5G actually changes
Three things separate 5G from 4G, and they matter in different ways.
Speed. The standard was designed with peak data rates of up to 10 gigabits per second in ideal conditions, against the far lower peaks of 4G. Peak rates are laboratory figures, not what you get on a bus. In the real world, speeds are much lower, but still well above 4G. In the UK, independent testing by Opensignal covering October to December 2025 found an average 5G download speed of 187 Mbps on EE, with an average 5G upload speed of 20.2 Mbps. That is the kind of speed that downloads a film in minutes rather than the better part of an hour, and it is a genuine step up from typical 4G.
Latency. Latency is the delay between your phone asking for something and the network answering, measured in milliseconds. Lower latency makes video calls smoother and online games more responsive. The international standard for 5G, known as IMT-2020, sets a target of 1 millisecond of latency for the most demanding uses — but that figure describes the radio link alone, in ideal conditions, not the whole journey your data takes. In practice, the tightest delay target 3GPP actually standardised is 5 milliseconds, and everyday 5G latency is usually measured in the tens of milliseconds. It is better than 4G, but the famous “1 millisecond” figure is a design target, not a promise about your phone.
Capacity. 5G can serve many more devices at once in a crowded place — a stadium, a station concourse, a festival — without the network grinding to a halt.
How 5G works: the radio waves
5G uses two main kinds of radio spectrum, and the difference explains why your experience can vary so much.
Sub-6 GHz is the workhorse. These are frequencies below 6 gigahertz, close to the bands 4G already uses. They travel well through walls and across distance, which makes them good for covering towns and countryside. Most of the 5G you will actually use is sub-6 GHz.
Millimetre wave, or mmWave, uses very high frequencies, roughly between 24 and 100 gigahertz. It can carry enormous amounts of data at very high speeds, but only over short distances and mostly outdoors, because the signal struggles with walls, windows, and even rain. You will find mmWave in dense city centres, stadiums, and airports — not in a village.
Not all 5G is the same: NSA, standalone, and 5G-Advanced
This is the part most adverts skip, and it explains why two people on “5G” can have very different experiences.
Non-standalone 5G (NSA) was how most networks launched 5G. The phone connects to a 5G radio for data, but still leans on the older 4G network for the control signals that set up the connection. It is faster than 4G, but it cannot deliver the lowest latency or the newest features, because the 4G core is still doing part of the job.
Standalone 5G (SA) removes the 4G crutch. The phone connects directly to a 5G radio and a new, cloud-based 5G core, delivering lower latency, better handling of many devices, and features such as network slicing, which lets an operator reserve part of the network for a specific use. Independent testing shows the gap is real: in the UAE, Opensignal found that users on standalone 5G in the second quarter of 2026 got download speeds 65.4 percent faster than users on non-standalone 5G — 368.7 Mbps against 222.9 Mbps — with 6 percent lower latency.
5G-Advanced is the next step, not a new generation. It is defined by 3GPP Release 18, which reached functional freeze in March 2025 and full protocol stability in June 2025, and it continues through Releases 19 and 20. Think of it as 5G version two: faster uploads, smarter use of spectrum, and better support for demanding uses such as extended reality. Rollouts are under way in South Korea, Japan, China, Germany, Canada, and selected markets in the United States, and the industry body GSA reported that 11 operators worldwide had launched live 5G-Advanced services by October 2026. Some operators brand it with a plus sign, such as 5G+, so the name on your screen may vary.
How much coverage is there really?
Coverage has grown fast, but the headline percentages hide big differences between places and between networks. In the UK, the regulator Ofcom reported in its Connected Nations update for spring 2026, using data from January 2026, that outdoor 5G coverage from at least one network reached 96 to 98 percent of premises. But the same report shows the detail that matters to you: coverage from a single network ranged between 76 and 94 percent of premises, and only 64 percent of premises had outdoor 5G from all four networks. Standalone 5G was lower again, ranging between 49 and 85 percent across the three operators that had deployed it. By land area rather than premises, 5G from at least one network covered 73 percent of the UK.
The lesson is simple: national percentages do not tell you whether 5G works at your address. Check your operator’s coverage map for your postcode, and check indoors as well as outdoors, because walls and building materials can cut the signal sharply. Rural areas still lag behind cities, and that gap will take years to close.
Where 5G actually makes a difference
For most people, most of the time, 5G changes three everyday things.
Downloading and streaming. Big app updates, films, and games arrive noticeably faster on a good 5G connection. If you regularly download large files on mobile data, this is the benefit you will feel first.
Video calls and gaming. Lower latency means less lag on calls and a more responsive feel in online games. It will not fix a bad connection, but on a strong 5G signal the difference from 4G is real.
Crowded places. At a concert, a match, or a busy station, 4G often slows to a crawl because thousands of phones share the same capacity. 5G handles the crowd far better, so your messages and maps keep working when you need them most.
Where 5G matters less: ordinary web browsing, email, and social media already worked fine on 4G, and 5G will not make them feel dramatically different. And 5G does not fix a weak signal — if you have one bar of 5G, a strong 4G signal will often serve you better.
What to check before you upgrade your phone or plan
Do not upgrade on the strength of an advert. Run through this checklist first.
- Does the phone support 5G — and the right bands? Almost every new mid-range and flagship phone now supports 5G, but budget phones may not. Check the specifications for 5G support, and which bands it covers in your country, because a phone sold in one country may support different bands from the same model sold in another.
- Is there 5G where you actually live and work? Use your operator’s coverage checker for your home postcode and your workplace, not the national map. Ask friends on the same network what their signal is like indoors, because walls can cut the signal sharply.
- Does your plan include 5G? Some cheaper plans are still 4G-only, or they cap 5G speeds. Check the plan details before you sign, and check whether there is a fair-use limit on how much high-speed data you get each month.
- Is it standalone or non-standalone? If your operator offers standalone 5G, ask whether your plan and phone support it. It is the version that delivers the lowest latency and the newest features, and it is becoming the standard.
- Do you actually need it yet? If your 4G phone works well, your contract has months to run, and you mostly use Wi-Fi at home, there is no rush. 5G is now mature enough to be the default choice when you do upgrade — but it is not worth breaking a contract for on its own. If you use your phone as a hotspot, travel a lot, or work from crowded places, the case is stronger.
Common questions
Do I need a new SIM for 5G? Usually not. Most existing SIM cards work with 5G if your phone and plan support it. Some very old SIMs may need replacing, and your operator will tell you if that applies.
Is 5G safe? 5G uses radio waves in the same family as 4G, Wi-Fi, and television broadcasts. International safety guidelines set exposure limits, and regulators in the USA, UK, Australia, and Canada all apply them.
Will 4G disappear? Not any time soon. Operators are still investing in 4G, and it remains the fallback when 5G is unavailable. Your 4G phone will keep working for years.
Does 5G cost more? It can. Some operators charge more for 5G plans, and some include it at no extra cost. Compare the total monthly price, not just the headline speed, and watch for data caps.
What is the difference between 5G and 5G-Advanced? 5G-Advanced is an upgrade to 5G defined from 3GPP Release 18 onwards. It is not a new generation like 6G, which is still years away from commercial use. If you buy a phone today, 5G-Advanced support is a bonus, not a necessity.
The bottom line
5G is real, it is widely available, and it is genuinely faster and more responsive than 4G — but the size of the improvement depends on your phone, your plan, and your postcode. The headline speeds in adverts describe ideal conditions, not your street. Before you upgrade, check the bands your phone supports, check coverage at your address, and check that your plan actually includes 5G at full speed. If those three boxes are ticked, 5G is the right default for your next phone. If they are not, a good 4G connection will serve you perfectly well until they are. And remember that 5G is only half the story: our guide to what Wi-Fi 7 is and how it works covers the wireless network inside your home, and our guide to what a VPN is and whether you need one at home explains how to keep your connection private.
Sources verified 14 Nov 2026: Ofcom Connected Nations update, spring 2026 — for UK 5G coverage (76–94% of premises per operator, 64% from all four, standalone 5G at 49–85%, January 2026 data); Opensignal January 2026 UK Mobile Network Experience report — as summarised with EE average 5G download speed of 187 Mbps and upload of 20.2 Mbps, and Opensignal UAE analysis showing standalone 5G 65.4% faster than non-standalone; 3GPP Release 18 and 5G-Advanced — for the March 2025 functional freeze, June 2025 protocol stability, and GSA’s count of 11 operators with live 5G-Advanced services by October 2026; ITU IMT-2020 latency targets — for the 1 ms radio-layer target and the 5 ms tightest standardised packet delay budget. No speed or coverage figure was taken from memory; all figures above come from these sources checked today.