I think you missed the point I was making and 3 of the points have no baring on what is happening in South Korea.
1) It will be a premium service in the UK and far more expensive than 4G.
EE, Voda etc. will price gouge you for early 5G, history tells us this is exactly what will happen. They still do it on 4G now (see EE essentials VS EE Max). Coverage will be poor for the first 18 months while they build out the network, again that is a fact.
2) Network speed isn't generally what dictates the overall speed something loads.
You will not see significant real world speed improvements on 5G vs good 4G on a 2019 phone because its still constrained by a low power SOC. There is already enough bandwidth to download a web page in a fraction of a second on 4G, it's the rendering on the phone which takes the time. Sure you'll see big numbers on speed tests but they are not real world.
For example going from 40mbps to 80mbps on FTTC doesn't make a noticeable difference to web browsing speed even though there is twice the bandwidth. It makes a noticeable difference when someone is streaming 4k, 2 people browsing and someone playing games but that isn't a use case you see on a phone.
3) Frist gen 5G phones will have less battery life because they need a discrete 5G modem and antenna modules on top of the existing 4G modem built into the SOC and standard antenna for cellular, wifi and bluetooth. The modems are physically as big as a Snap Dragon 855. So more components, more power usage and less space for batteries (or a bigger phone). Either way I am correct in saying the battery life will be less on a first gen 5G phone, its just history repeating its self over again with 3G and 4G.
Source:
https://arstechnica.com/gadgets/2018/12/dont-buy-a-5g-smartphone-at-least-not-for-a-while/
4) Coverage
IN THE UK will be poor for at least 18 months while they upgrade thousands of towers and upgrade the back haul. Due to the frequencies 5G uses coverage indoors will be poor. Most phones will still spend most of their time on 4G.
Speed for mobile phones is not 5G's biggest advantage, its capacity on the airwaves. 5G has much wider applications such as a fixed line alternative when you can stick a big antenna on it and a powerful modem/router that can handle gigabit speeds.
