I have had this issue with my iPhone 6s and then I got an iPhone 8 plus, still the same thing. I've tried going through *86 and deleting them, then going into the green phone screen to physically delete them. Sometimes they come right back and other times they stay gone until I get a new voicemail. I've tried turning on airplane mode and turning off wifi, deleting, then turning off airplane mode and turning on wifi. That doesn't work either. I'm really annoyed with this issue.
Hi Melcan72, is the iPhone completely updated with the latest Apple iOS which is 12.1.2 and the latest Verizon Carrier version which is 35.0.2
The Verizon Carrier version would be of importance where it refers directly to Verizon that handles the voicemail.
If you go to Settings > General > About , in the menu there should be Version for iOS 12.1.2 just below that will be Carrier and Verizon 35.0.2
Tap the Voicemail button in the bottom right corner. Find the voicemailyou want to delete. Tap it once to reveal the options or swipe right to left to reveal to Delete button. Tap Delete and your voicemail is deleted.
Melcan72, my first thought was possibly Verizon carrier version unfortunately that was of no help. Where you've tried airplane mode, *86, and physically deleting from the iPhone. I seem to think this has something to do with back up and Apple or iCloud especially where you've changed iPhones. It seems like some back up is in a loop on restoring voicemails? What is showing up in your iCloud account? Is there more than one iPhone? Can you try turning off iCloud back up in the settings? I've read before where visual voicemail can be saved with iCloud, have you ever used that?
MELCAN72, keeping your voicemails organized is imperative to ensure that you do not miss any important information. We are here to work toward a resolution on the problems with voicemails not deleting. Salisbury provided some great tips. How are other services on the phone working? Have you noticed any patterns on the voicemails that come right back? Do all other voicemail features function properly?
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I’ve gone in and physically deleted voicemails by calling my number. I’ve tried airplane mode, regular mode. Sometimes they delete sometimes they don’t. When they do delete and I get a new voicemail about the last 10 reappear as new voicemail, like they were never listened to.