They are, and unless you know from experience they have a good signal in your area, don’t believe a damn thing they say. According to EE and their coverage map, I’m slap bang in the middle of their best available coverage. Except, for the past two years, I’ve had no data reception at home, and only get calls in one spot of the entire house.
Ultimately they decided that it was the building material of my house which is preventing the signal penetrating. Fair enough, except, I just picked up a Three payg sim to trial their network and I get an amazing 5G signal in every room of the house. Bye, bye EE…
… Oh, if you’re wondering why I stayed beyond the initial 14 days, they consistently told me that work was being performed in my area, and that as soon as it was finished, the signal would be returned to normal.
Like a fool, I believed them (as it’s supposed to be a good area according to the coverage map, not a gap, or drop in service quality in it for many dozens of miles).