Australia hasn't had a POTS for a while now, since the National Broadband Network was "complete". They literally ripped the copper out of the ground and sold it for scrap, they even made specialised machines to make the task easier: https://www.rg.com.au/2022/09/29/telstra-mirait-take-deliver...
Hasn't really been much of an issue day-to-day. My mother for example still uses her landline phone on the same phone number she's had for decades via VOIP that the ISP operates. The vast majority of people use mobile phones as their primary voice service and it all seems to work just fine. But there has been a few notable outages (e.g: Telstra and their NTP mess, Optus and their emergency-call routing issues), and of course there's fringe issues with coverage gaps, but overall I'd say the mobile voice network is as reliable as the old POTS was (which was far from perfect).
Hasn't really been much of an issue day-to-day. My mother for example still uses her landline phone on the same phone number she's had for decades via VOIP that the ISP operates. The vast majority of people use mobile phones as their primary voice service and it all seems to work just fine. But there has been a few notable outages (e.g: Telstra and their NTP mess, Optus and their emergency-call routing issues), and of course there's fringe issues with coverage gaps, but overall I'd say the mobile voice network is as reliable as the old POTS was (which was far from perfect).