Theoretically, the setting may not make a difference, but empirically it does.
I along with several others noticed a real difference by making the change from 2 to 0. The number of rings was very consistently 2-3+ for my phone before the change and 1-1.5 after. Where the rubber hits the road here is that I used to miss MOST of my calls since by the time my phone started ringing, VM was only 2 rings from picking up and me missing the call. Now I have extra seconds to get the phone out of my pocket and rarely miss a call I try to pick up. The number of rings a person hears when calling you does matter for VM: you only get 5. So, anything to reduce the lag between the caller's rings and my phone ringing is worthwhile to me.
For what it's worth, my slot mode is "enabled" and the index is "0".
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