Re: To EE customers - it could be worse
Could be many reasons to still be with them - perhaps all the other networks have zero bars. Perhaps it's a work phone. I'm in a house with near-zero bars from all operators. May well have to invest in a phone that supports wifi calling - although conflicting messages from EE customer support as to which phones will work (might ring a few more times and see how the votes tally).
Reasons to get shite thru'put: your account profile may be such that you're deprioritised, your phone may not be of the correct category (e.g. if it's old, or a grey import that doesn't have the right frequencies) to use the service better, the network may be misconfigured, an annoying neighbour is sucking up all the resource (unlikely for 5 years, tho).