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Yes, sometimes it really is just down to better coverage, but if it's a city, it's almost always covered well by all 3 providers. > I even asked a few strangers what network they use and how come they have reception However this is selection bias, you may actually have switched to a less popular network (which is better), or it could be coverage, it's hard to tell. The funny thing is that you can see how over time people will be switching back and forth between providers, even though there may actually be little change of coverage, any improvements could be more to do with movement of subscribers. Unfortunately 5G wont entirely eliminate this phenomenon because higher frequency comes with the disadvantage of being less penetrating to solid structures, so e.g in a train, or building people will sill be contending with each other over 4G quite often. In the end, all that matters is what works, and you can only really test that empirically or by using other's to gauge performance as you did. Luckily you can now test 2 of the major UK networks without a contract, "Three" and "Vodafone" provide contract-less unlimmited month-to-month sim only through their sub-brands "Smarty" and "Voxi"... and I highly recommend using these over the main brand because you always have the flexibility to change quickly as network conditions change (I've switched between these two multiple times for a home LTE router due to changing user contention - which I've only inferred from the fact that there were no new towers in the area while maintaining the same RSRQ, and connecting to the same cell ids). www.cellmapper.net is a good resource for roughly gauging coverage... but far better than any of the vague maps given on ISP sites, it actually shows you individual cells for each tower with rough directional areas, I've found it quite useful for debugging weird issues with antenna positioning on permanent LTE router setup due to locking onto bad towers (which unfortunately is not directly controllable on standard user equipment modems). |
To add, if you want to try O2, there's GiffGaff/TescoMobile and if you want to try EE there's 1pm Mobile and EE offers PAYG sims as well.
I have 5g internet at home, tested every network and EE was miles faster than anyone else even though I live close to all the towers. I did find that going on a contract was alot cheaper than PAYG, and it's the only way to get unlimited data on EE. Still it's £30/month which is cheaper than what Voxi is offering.
With the wifi on the tube, the EE one works alot better than Three who goes through the Virgin wifi network. EE installs a profile so it auto connects quite reliably when you stop at stations.