Just to help clarify a couple things: I'm using a Samsung S20. I've done every network reset, cache wipe, phone on/off, tried my sim card on another device etc. I ported from Telus a few days ago. At first things were working, then randomly yesterday...
They're currently working on a fix. Telus & Koodo are experiencing an issue as well. I ported over two days ago and realized this afternoon I couldn't send texts, but could receive. I opened a ticket with PM.