this post was submitted on 09 Aug 2023
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Voicemail isn't something Android controls. Your carrier hosts the voicemail service and keeps a copy of recorded messages. Carriers usually offer automated access to control these settings (check the SIM toolkit) but they're in control of the services they provide to you.
Android can try, but it's powerless if your carrier doesn't implement the right magical dial codes.
I don't know why Google doesn't offer settings for the number of rings before automatically declining a call. Other dialer apps I've seen have offered that. Your carrier probably offers that functionality as well.
Back in the day (ow my back) carriers let you control how calls are diverted by dialling one of those * 123*12345# type numbers.
I'm not sure, but I think these USSD/GSM codes still work nowadays.
They'll probably still work. I believe they still form the basis of how the Android settings screen can control carrier settings, though the number of settings available seem to have gone down over the years.
They still work. I use them for routing my voicemail to the Jolly Rodger Telephone Company.