Yes I still have the issue, I can make regular calls etc all fine from the mobile.
Just to confirm the problem is as follows. I have voice messages notice on phone, I call the voice messaging service, when promoted I enter my pin followed by hash key. Line goes silent for approx 15 seconds, then have message saying thank you for calling VM message and call terminates.
I hope you can fix this soon as I will have to disable my VM tomorrow so people do not assume I'm getting their messages.
Thanks for responding, Emily. This is a SIM only contract. The phone is a Samsung J5 (2017). I don't believe it has ever been possible to listen to voicemail messages, though it is possible to leave them. When a voicemail is left the phone receives a text message to say that there is a new message. On calling Voicemail from the phone the normal PIN dialogue takes place, including rejection of an incorrect PIN. Once the correct PIN is supplied all that happens is several seconds of silence followed by a goodbye message and termination of the call. Shortly after the SIM was installed, the phone number was changed by transfer from an old phone. I wonder if this could have caused a voicemail mix-up.