Down for me in California<p>Downtime detector shows it down since 7:30PST which is about when I started having issues:
<a href="https://downdetector.com/status/signal/" rel="nofollow">https://downdetector.com/status/signal/</a>
Not sure if Signal still uses AWS infrastructure (there were threats they'd be shut down at one point), but EBS us-east-1 is having some serious issues right now.