I want to ask a question to an Islamic Scholar. Please define us, is it a sin to set a ring tune as an incoming calls tune?
Generally speaking, no.
But if you could, perhaps switch the tune to something Islamic based like the Adthan, Quran recitation, or even a nasheed.
As far as I’m aware, there are ring tones the sounds of birds, nature, and there’s the occasionally flash too where your phone would light up if there’s a call (I think, not too sure if that’s only for phone notifications).
All in all, it’s not like you’ll be listening to it for fun, it’s just to notify you someone is calling you.