We are thinking of changing to BT since we have BT broadband.
The main hesitation is that with our Vodafone contract comes a Suresignal box which is attached to the newtwork. It creates a five-bar signal in the house and routes the call to Vodaphne via broadband and then onwards to the mobile network (and vice-versa for incoming calls). Suresignal cured years of cursing the signal quality at home, missed calls and standing in the front garden to make important calls when things were particularly bad. We wouldn't go back!
Does BT offer a similar system? I know it's possible to make calls over wifi as if they the home landline calls but this question is about pure mobile, with any usage coming off the contract minutes. The solution would need to handle both incoming and outgoing calls and, sadly, it's deal-breaker if BT don't offer an equivalent.
Do you know for sure that the EE signal is equally as poor as Voda in your area? Maybe such a solution isn't even required?
My advice would be to keep to the devil you know. Why would anyone throw away a proven, working acceptable solution for one that might work. That is what I did and despite weeks of effort and frustration have gotten no-where and nothing is getting resolved. I would not want you to be tempted into following my example on the basis you do not know for sure the alternate might not be worse than your current service. Imho that would be daft. Warning, despite me being in an area marked as 'excellent' for reception I have no service and the only suggestion received from BT is that I can cancel my contract as they do not know what is wrong.
Are you on a trial for this, because as far as I'm aware the Hub 5 does not offer this and BT have not launched a Hub 6 model.