Google Pixel phones not receiving phone calls after March 2024 update

Many Google Pixel owners globally have had issues receiving calls and texts after a March software update to the phones. Incoming calls are either directed straight to voicemail or callers receive a "not available" message. The Pixel phones show full bars, but never ring.

I just got a new Pixel 8 a couple of weeks ago, and I have already missed a handful of important calls. It's really bad that the most basic functionality for a phone has been broken for weeks.

Google has not acknowledged this anywhere.