With Tesco 02, connection is awful, we have lots of trees around and making a call is impossible, no network component in. Paid for phone, am in SIM only so good price. How can I find out which is the best phone ( just a basic for calls and internet)) and best for connection for my area, and not costing a packet every month? I don’t play games, just emails WhatsApp and photos basically. I am not technical, thanks all.
Those checkers are rubbish and very misleading. I have a vodafone and an O2 phone and the coverage checkers for both say good with 4 bars indoors and out up to and including 4G for my postcode and it's just not true. Mobile calls (not even talking internet) break up and are muffled as I move about the house. You'd do far better to ask neighbours.
It very much depends on the type of house you have and the external landscape, too. The types of walls, window frames, proximity to hills, tall buildings will affect the quality of the connection.
Good idea to ask your neighbours if they have similar houses to yours.
Are you buying a new phone as well as a new SIM card?
By the way, when you do decide on a new SIM get it on a one month rolling contract so you can easily change if it's rubbish. You can swap to a longer contract if you're happy with it later