iPhone 6s voicemail fails

[mum3kidz]

Can anyone help my IPhone 6s on VF was set up to get voicemail but recently when I try to accesses voicemail by various methods I get " Call Failed" message and no access to voicemail ?

[BandOfBrothers]

Hi

May I ask if you've gone through the set up process again by turning it Off and back on. 

And or tried cancelling all diverts and reset it up. 

https://support.vodafone.co.uk/calls-texts-and-voicemail/voicemail/48713133/cancel-all-diverts.htm

 If so then Live Chat or Customer service on 191 should be able to reset it for you. 

[mum3kidz]

It seems when I upgraded my contract voicemail was not activated on the new contract,even though it wasa active on my old contract and it is turned Off by default at Vodafone on all contracts and needs to be requested to be turned on , even though I have had it active for the last FIVE years