When someone leaves me a voicemail I get no notification , sometimes after about 3 weeks I will see some of the voicemails have been recorded. This is very bad for my business, as I have no way to know that someone has left me a message , unless I continually check/play voicemail. I dont get dings very often either when I get a text, usually I get 1, but if I continue a conversation, I will get no more notifications so I have to keep looking at the phone. Its an iphone 6s plus. Thanks for any help or tips. Yes my sound is on/up. Thanks