You can turn off voice mail by dialling 1760 free from your iphone. Dial 1750 to turn it back on.If you are on a monthly contract, voice mail is free but chargeable on PAYG. Hope this helps
I'm on 'simplicity' pay monthly.. but i'm being charged to use 901 😐 is this right!? It's a bit annoying that I'm paying a lot each month but can't use my voicemail..