Who is your mobile phone provider because some like 3 route your mobile calls in black areas via your wifi connection.
I have been using it for years in a village with NO, yes NO mobile signal. And it works.
Here is the 3 take on it.
Hope this helps!
Three has announced the rollout of Wi-Fi calling features for those with Android or iOS devices on the UK mobile network. It means you can still use your phone for calls or texts in poor signal areas or underground, as long as you have a strong Wi-Fi connection.30 Jan 2017
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