I moved from Vodafone to EE a few months ago when I switched jobs. Signal is patchy with most providers where we are (South East) and EE is pretty non-existant where I live. I work from home and use my mobile a lot, the thing that sold EE to me was the wifi calling, so with no cell signal the call routes through your broadband. In theory it’s great but the reality for me was it’s hopeless (more down to poor wifi strength from the router IMO). After several heated exchanges they sent me a signal booster which gives me full 3G (not 4G) signal throughout the house, but again routes through the broadband. Not much use to you if you have poor broadband I know, but info for others.
I wasn’t that impressed with the customer service with EE, it took a lot of calls and threats to leave before they did anything useful. To be fair to them I’m happy now but it was harder than it should have been getting to that point. Their call routing on the support line is diabolical too, quite often you go through 5 layers of automation only to be told to wait for a human and then cut off.
I would suggest you get a PAYG SIM for a month or two to test the service where you are, depending on location a mile can make a big difference to signal strength.