iPhone 6 with IOS 11.1.1 here, and everything works good except voice apps. I have done factory reset on watch, forgotten Bluetooth pairings on watch, and iPhone, and removed Pebble app and reinstalled, and re-did Bluetooth pairings. I have rebooted iPhone numerous times. Once this morning Voice Note actually worked. But after that, every time I try to use Snowy, or Voice Note, or Send Text, the pulsing dot with a progress line never finishes going across the screen, and the microphone picture never comes up.
I am pretty convinced that this is an IOS 11 problem, since all these problems started when I updated to IOS 11.