I switch from Sprint (model 6035) to Verizon (7135). I call from metro Phoenix and am told my voice is much clearer -- so either the phone or the service is better. Frankly, my experiences with Verizon have been better coverage and much better coverage area (I had Verizon until I swithed to Sprint just to get the 6035 dirt cheap). For a modest increase in price, I now get 1200 unlimited minutes (excluding nights, weekends, and mobile to mobile). I made a very good decision for me.