[itsall_cooool]

I set my SCI to 0 also and after a week I believe my battery life is actually about 20% better, this is after consciously keeping track of when I removed from charger, what usage I had for the day, and even noting when in poor reception areas.

And after repeated testing I'd say my phone rings within 2 seconds of hearing it ring from the caling phone (before it was much longer, usually going to VM after 1-2 rings on my end).

Forget setting '1' go for the gusto and try it yourself, at worst case you can change back easily.