I got no warning at all, only on NINA.
I’m still on FP4 build B.079 tho, because I had some update issues.
Are cell broadcast warnings enabled in your settings?
As it has no SIM it will not do anything…
Yes, I just checked.
Edit: oh, I just had a closer look and realized that “test warnings” were disabled. This should fix it now.
Where did it say something about no SIM? Also shouldn’t those emergency broadcasts also work without a SIM just like emergency calls?
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No, those test warnings should have no bearing on you receiving the warning today, as it was issued as a regular warning. Those test warnings you just enabled are used to test the infrastructure without any prior announcement to the public.
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Well, my old smartphone has no sim and so it has no contact to the radio cell and keeps silent all the time. I think, radio contact is important for cell broadcast
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Why should a test device have a SIM? And yes it only works with SIM as I can confirm from my FP3 having no SIM…
For emergency calls you do need a SIM card - not technically but because obviously there was some mis-use in the past and so this option was killed a few years ago. But when looking at the technical side: Without a SIM the phone will not create a mobile connection at all, unless (in the past) you dialed 110 or 112. Then it obviously was able to connect to some mobile cell. But since the default without SIM is “no connection” you cannot get warned, either.
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Sorry, I didn’t see any indication they were talking about a test device. But it appears that was the case anyway.
As for the SIM issue:
That’s unfortunate to hear. Although I haven’t looked into the technical specifications of cell broadcast, as far as I can tell it should technically be possible to receive those notifications without a SIM card as long as there is no setting in place that completely disables/ignores your transmitter/receiver. After all these emergency notifications are push notifications that go to any device in range of the base station transmitting it without requiring a phone number or some sort of authentication. That’s why these notifications can serve millions of devices in an instant without overloading the network. They do not expect any acknowledgement by the receiver. And your SIM card is only needed to authenticate yourself towards your provider, so that you can communicate over their network using your assigned phone number.
Für Cell Broadcast Warnmeldungen wird eine Standardtechnologie des Mobilfunknetzes genutzt: Jedes Mobilfunkendgerät registriert sich automatisch in einer Funkzelle, über die ein Netzempfang hergestellt wird. Der zentrale Verteiler einer Funkzelle kann dann in umgekehrter Richtung Warnmeldungen an alle Mobilfunkendgeräte versenden.
Also ohne eingelogged beim Provider nix cell broadcast, wäre jetzt meine Laien Interpretation…
I see. I wasn’t aware they disabled SIMless emergency calls in Germany due to missuse. It definitely still works in some other countries. Although I don’t really see the potential of misuse in the other direction (cell broadcast). So in theory a system that allowed this could be established.
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This time, I received the warning, one in German at 10:59 and one in English at 11:00. Katwarn/NINA Push worked too.
Single SIM (physical) with Fraenk (Congstar/Deutsche Telekom brand), Fairphone 4 running CalyxOS 4.13.1
But yes to what was written in this thread already, the UI for the cell broadcast is kind of bad. If I dismiss the pop up pressing OK to stop the alarm, the message is gone. No chance reading it again afterwards.
You can read them later 
Settings → Notifications → Wireless emergency alerts → Emergency alert history
(Since you are on Calyx/Android 13 as well it should be there, don’t know if that’s available on stock FPOS)
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Ah great, thank you! Good to know for a real alert!
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Also for me I did press okay but a notification remained that when clicked on reopened the message without the alarm sound.
I do think an additional ‘mute’ button on the popup would be convenient though.
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How does that setting behave though? Is there some “it’s over now” signal, does it have a hardcoded cutoff time, or does it repeat every two minutes until eternity? xD
Edit:
I guess eternity it is…
Auch Fernseh- und Radioprogramme werden für den Probealarm unterbrochen. Dort wird nach einer Dreiviertelstunde auch Entwarnung gegeben. Beim Cell-Broadcast-Verfahren für Handys ist das noch nicht möglich – laut BBK wird aber daran gearbeitet. (source: FAZ)
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Didnt test and once still gives the chance to get it a second time in case you by mistake didnt read the frist one before hitting ok…