Rather than focus on the phone, could you look into getting a femto cell installed?<p>In my country some of our providers support these and you can buy&#x2F;install them legally. You could contact your networks to see if they support this.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Femtocell" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Femtocell</a><p>I had an old Nokia candy bar that used to get great reception. If he&#x27;s just making calls this could be good, plus in a low reception environment batteries drain quickly too so the candybar would be suitable.