I live in Bristol, in the BS7 (near the County Cricket Ground). I switched from Tesco Mobile (O2) to BT Mobile earlier this year in the hope that I would get a better mobile phone reception at home and in the surrounding area as I also switched to BT full-fibre broadband too (this has been very good).
Sadly I have to report that the mobile reception is even worse than with Tesco Mobile and now I cannot get a signal anywhere in my house and it breaks up when I am walking outside in the local area too. I can't even send SMS messages successfully, which has become very frustrating!
I could go someway to understanding the reception issues if I lived in a rural setting but I am near enough in the centre of the Bristol and up on a hill too..!
Is someone from BT Mobile able to advise why this is the case and what if anything is being done about it?
I just entered BS7 9EJ into the BT coverage map (https://www.bt.com/mobile/coverage-checker/) and sure enough it confirms low signal on 5G but excellent on 4G.
You should be able to use Wi-Fi calling from home to combat a poor signal but you may need to check that it is enabled on your phone
BT is a virtual carrier operating off the back of EE who they own. If you're still in your cooling off period, it may be useful to ask others in your area if they are on either and if so what reception they get