I’ve used Google Voice as a voicemail service for awhile because they provide the option to email a transcript of each voicemail (they’re often bad, but usually you can get the gist of the message). I’ve been pulling back from Google, so I went back to regular voicemail from my phone carrier, which went smoothly, except that Google wouldn’t let go of the voicemail button on my phone–no matter what I did, the voicemail icon dialed my Google voice number and not my phone carrier. I could dial “1” or “123” to get voicemail, but the icon was stuck on Google voice. (I know, I know, first world problem.)
To fix it, I had to call tech support for my phone provider, and then had to escalate to level 2 support. There’s an over the air update that’s supposed to reset the voicemail number, but it didn’t work. Eventually, I had to take my SIM card out of my Android phone and put it in a dumbphone to recieve the update. Leaving Google: it”s not always easy.