What is the best mobile for phone calls?

What is the best mobile of all makes for making calls? Which has the best, most sensitive 'radio' system?

I have had 3 x Moto G's. All have worked in a rather rural area. I bought an HTC M8s and it loses connection whilst the Moto's all stay connected. All side by side and on O2 (UK). I installed a Network Signal Strength app and by comparison the HTC is way down on the Motos for reception.

Is there anyone testing the call sensitivity? I can't buy any phone I fancy, test it and find it's down on reception! Please help before I make another expensive mistake!
Thank you
JohnG

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