Re: <Title is optional>
Could just as easily be better backhaul, or more towers, or just better prioritisation.
They're never going to know from crowd-sourced data, and the mobile operators aren't going to discuss internal technical affairs.
To be honest, speed isn't so much an issue. I'd happily halve my "max speed" if I could more data for the same price.
On a Three mobile broadband SIM, I get more than enough bandwidth even at peak periods to watch all my telly over it, what I don't get is enough data to cover what I want to do.
And Vodafone (the only people who give more data) are still too stupid to allow me to order a SIM despite the fact that they have a better deal with all the TV channels and big websites not counting towards your data allowance. I can't do anything on two accounts I "registered" and ordered a SIM on until I activate the SIM, but haven't seen any SIMs at all, and signing up with another email just starts the process again.
(P.S. No, just because you have a 100Gb SIM does not mean that you can tether / mobile broadband for 100Gb, and I use my SIM as a broadband replacement for the home network, not watching all my TV/movies on tiny phone screens tied into 36 month contracts).
But the fact that I can use a 4G SIM in a cheap Huawei box off Amazon to run my entire household is pretty impressive and shows you that the "max speed" doesn't really mean much nowadays. Even my Steam downloads happen just as fast as when I used to have a broadband line.