Welcome to Vodafone Community
@Thaigreencurry Have you heard anything back from Apple? We're still waiting for more information regarding this matter.
Still no fix for this issue. I didnt even realise there was one until an irate customer emailed me to say he had left several VM's I thought he was lying until I checked and there were 12 grrrrr.
Dial 121 listen for options press mailbox settings number 4 then listen to more options select 3. I have selected text and alert for now.
I am using GiffGaff (part of 02) and I have issued with voicemail notifications too: on screen notification no longer works, and I have to use "notification by text" to be sure I dont miss any messages. I believe the issue is with the iPhone and iOS 10.
We've been made aware by Apple that there's an issue with the voicemail notification icon on the iPhone 7 and iPhone 7 Plus. Apple are working to get this sorted as soon as possible, but are unable to provide a timescale for when this will be fixed.
In the meantime, you can change your settings to receive voicemail text alerts (by calling 121 and following the prompts to change it).
Use a Visual Voicemail app like Hullomail and you completely bypass the network voicemail service and get a much better and informative system.