I also regularly receive the voicemail saying "goodbye"... it's indeed quite "annoying", but I would mainly like to know if it's dangerous (virus or anything... ) Thank you for your comments ;)
What do you mean by voice message without a missed call? These are messages that I find in my voicemail when I check the answering machine about missed calls on my landline... the message is simply a female voice saying "goodbye." I receive several of these every week for quite some time...