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Hi, I got onboard Vodafone two days ago, via eSIM as my second line with a temporary number.
My primary line doesn't have V-V, but I was very happy when I saw Vodafone's V-V working right away and seamlessly - I just got a SMS that you now have Visual Voicemail on your phone, indeed the interface was there, I tested it and it worked. I called the number from another phone, left a message, it showed up in V-V.
Then I ordered my number to be transferred from EE (which also had V-V) to VF. It happened yesterday, and whilst everything else works (i.e. both lines have iMessage), I cannot make V-V working. It has Call Voicemail button but that dials my primary line voicemail.
I went through instructions thoroughly, including section what if it still isn't working for me, and then I called 191 and we went through resetting the voicemail on the number, but it didn't work. I tried the instructions again, to no avail. I even tried to Reset Network Settings which let me choose the data plans again - I tried to use VF as primary line, I turned off Wi-Fi, used data... Looks like something is stuck - and unfortunately there's nothing in iPhone's Settings to un-stuck it. I suspect that somewhere there's still my temporary number linked with V-V and so I cannot get it on my original one.
Any hints? Thanks!
OK I got one more idea and it worked.
Instead of what I tried many times - switching what is my default mobile data or voice line - I just disabled my primary line.
Immediately (in a matter of seconds) I got a text Great news! You now have Visual Voicemail on your phone. And indeed I do.
I tested it and then turned my primary line back on but the V-V stayed.
It could be a pure coincidence but if you do have issues with V-V on the secondary line then go to Settings > Mobile Data > Data Plans > [primary one] > Turn On This Line > [off].