For more than 10 years I've used Skype to make and take telephone calls.
For a long time I think Skype has gone downhill, particularly the iPad version. More and more often it can't find the microphone or the user interface updates haphazardly like a bad React app or it will ring and ring and ring and there is no way I can hang up. On top of that I am getting an increasing rate of messages that seem like pig butchering scams and I am getting notifications about Donald Trump that I don't want.
It seems like you should be able to get a SIP number and access it with a tablet app, phone app or a desktop app but the last time I tried it it seemed all the SIP providers I found looked really sketchy and I struggled to get it working.
Is there some simple way to get SIP or another VOIP phone working as a consumer in 2024?
If the latter, I think just having an iPhone and iPad or Mac will let you natively do that: https://support.apple.com/en-lamr/102405 without needing to route the call through some rando internet service.
Otherwise, there's still Google Voice, but the call quality (last I tried) was consistently mediocre to terrible.
Vonage is still around too, providing similar VOIP services to Skype: https://www.vonage.com/unified-communications/pricing/
If you want a brand-name SIP provider, Twilio offers those services: https://www.twilio.com/en-us/client/pricing
SignalWire too: https://signalwire.com/use-cases/voip
I think at the end of the day, VOIP call quality is typically too dependent on factors outside of your control (codec, bandwidth, network congestion, etc.). And there's going to be additional latency since they have to route voice calls out and through some data center and to you. If there were an easy way to up the quality consistently, probably the business providers would've done that long ago and upcharged it as "Premium Voice" or such. The cell carriers did just that with "HD Voice" and such, but that's only when they can control both ends of the conversation. That's also why purely-internet voice comms (Discord, Zoom, etc.) can sound so much better; they have end-to-end control of the traffic. Generic VOIP/SIP providers that terminate to POTS don't have that luxury.