My phone is constantly losing signal

My phone is constantly losing signal. Even if I have google maps on for example it can't find me when I start driving and it stops giving me directions. Losing signal allows to lose location therefore leaving me without GPS when driving. I also started dropping calls and it says no signal in places where I had signal before. I have tried turning phone on and off, resetting it, going into airplane mode, updating software to latest version etc and nothing has helped. Is there any advice?

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