I left Three half a year ago so this is my review of my experience up until then.

When I first joined I had a 30GB contract SIM which was instantly bumped up to unlimited by staff when my wifi calling didn't work which was a nice upgrade.

The network was fine, it wasn't amazingly fast but for the price it did all it needed to and allowed me to stream video on the go. Any issues I had would end up getting fixed with credit applied.

Then it took a turn for the worst, more and more areas seemed to be under capacity. Started off with an area on the way to the city centre, then most of the route, then the train station. I complained about it and was given credit but nothing happened, then more and more areas became affected, I could no longer get signal in Birmingham New Street despite getting very good speeds before, the area on my way to work is now under capacity.

I decided it was enough and cancelled the contract, I had a bunch of empty promises of how it will be fixed soon and 5G will save us all but I had enough and left. This is a very situational issue but the way this was all handled should be known before joining.

I have since checked the areas in question on their issues checker, still reported as under capacity and will be fixed soon almost a year after being reported.