I didn't discover that my voicemail wasn't activated until my doctor's office called me a few days ago and I noticed they did not leave a message.
I just went through three days and countless contacts with ATT and a LOT of time (getting bounced back again and again to billing instead of to tech support etc; having to repeat my issue again and again; having an agent promise to test my voicemail and call me back but not do so). Finally, today, I a technician who would work with me. Fortunately I could hack into my daughter's phone so we could use that phone for conversation while I reset my phone's voicemail.
My service with the last rep was great, but the three days before that were utter hell.
At my age, being able to know that my doctors can leave me a message is a serious issue. 🙂