Welcome to Vodafone Community
I have just wasted time and credit trying to turn off my voicemail on my PAYG vodafone because your support webpage has some incorrect information on it. This is the page in error about the network voicemail service codes
Here is the relevant section:-
To turn off your voicemail:
Yes 1210 works but the second option 121 , 4, 4, 3 appears to just RESET your account to STANDARD VOICEMAIL options and turns it ON. Yes ON. The only way to turn it OFF IS 1210 or the standard GSM # codes.
Please correct and save wasting other peoples time and credit.
Thanks for raising this to us @andyt8 - I'll be sure to pass this along to our Website team, to get the information updated.