My Nothing 2 has no SIM and it still got the alert. It was connected to WiFi.
I can see the need and use for a National Alert that goes to all like this and the occasional testing of it. Couple of things I was surprised about:
1. Alert went to devices without a SIM also (test phones just connected to WIFI)
2. It did not alert on my AW Ultra
3. One of my phones displayed in Spanish instead of English (one of the test phones)
Oddly (I think), my 15PM, which was on Wi-Fi with the cell radio turned off, did not get the alert. My wife’s 15P, which had both cell and Wi-Fi turned on, did get the alert. If a device that is connected on Wi-Fi only doesn’t get the alert I think the goal is defeated, possibly on a huge scale. There are lots of places in the U.S. where there is no cell signal.