On that point, a friend of mine had Vodafone working fine at office, but not at his home where he shifted to, where Airtel was better - Jio had mixed results. So he kept switching providers - because he was using an iPhone. I used to tease him to throw it in dustbin and get a dual sim Android 😀 . He carried a second basic phone for some time - till Airtel improved at his home as well.