Mine stopped working also. After 3 hours of farting around with Xfinity I waas told that they could "activate" it for me for $9.99 month. It was wrking fine until end of May. I understood vm was included.
I can no longer view our call history or listen to voice mail online as of today. This started after spending four hours chatting with a couple reps because we could not hear any incoming phone calls. Rep said she didn't do anything with our voicemail, but seems strange that it happened while i was still chatting with her.
Same thing happened to me on the day I changed plans. My plan includes voicemail. I've had voicemail for this number for 6 years. When I check the status of the voice service it says "something went wrong".
I've given up trying to get ahuman to talk to.
I got through on the 800 number. First agent answered after about 5 minutes, explained problem. Transferred to technical agent, waited another 5 minutes. New guy took about 2 minutes to see that when they setup the new plan they didn't selec tvoicemail. He said wait 24 hours to see the change. I just checked this morning and everything is back to normal. I did have to setup my mailbox as if it was brand new. It was empty, so I may have lost some voice mails.