There's nothing wrong with sticking with what works. My old Nokia candybar style phones pretty much beat everything else as far as holding a GSM call in a fringe reception area is concerned. YMMV.
I'm using my old LG phone, which has a retractable antenna. I live and work in fringe areas of cellphone reception. I've tried to find phone ratings having to do with reception issues, but no luck! I used to use AT&T, went to Verizon, and it helped a bunch. The new one I was using is great for seeing the display, without my reading glasses. But not so much for receiving a signal. That's the phone I want. one that has an easily read display, for an old-fart like me. And one with superior reception, in fringe areas