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hi electricpeteGoogle voice.
https://support.google.com/voice/answer/115061?hl=en
Note out a lot if thing beside voicemail, but you can use it for just voicemail. Their voicemail service works with most carriers in us.
Google Voice is only available to U.S. Google Account users

thanksYou can can search 'voicemail' in the Play store and find some apps that might work for you like YouMail (apparently is kinda buggy, free version has ads) or PhoneFusion (has a monthly fee). You'll just have to check them out and see if one will work for you.
I know this doesn't help Gaia, but just for others who may be reading this thread, if you want the advantages of Google Voice, which are many, but don't need or want a Google Voice number, there's Google Voice Lite:
https://support.google.com/voice/answer/115127?hl=en

hiFree Features to Improve Productivity, Preserve Privacy, and Treat Callers Better.
thanks CrashdamageHere you go...
https://play.google.com/store/apps/details?id=com.youmail.android.vvm
https://play.google.com/store/apps/details?id=com.phonefusion.voicemailplus.and
There's LOTS more. Just search for voicemail in the Play store.