As bt Use EE then it must also be a problem for people on EE
for people like you why not use wifi calling assuming your phone is capable
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The coverage checker like all the one all mobile networks use is only a guide on what the expect the coverage to be like, and can not guarantee coverage indoors as they dont know the structure of your home.
But you can do a few things to check that this isnt a temporary issue..
Check your post code on the Network checker that your local mast is not having any issues