Same here (Amaysim):
Your device Fairphone 5 on [phone number] has been identified as unsafe, as it is not able to make calls to Emergency Services (i.e. ‘000’ & ‘112’). Please do not test call Emergency Services. This is not an effective test of your device’s emergency calling capability.
For your safety, amaysim is legally required to stop this device from accessing the Optus mobile network. From 10/03/2026 your device will be blocked by amaysim, which means you won’t be able to make or receive calls/text or use mobile data.
You immediately need to get a new compatible device to stay connected.