Hi, I’m Matt and I’m an O2 Guru, here’s another top tip for you iPhone.
Here’s how to switch off voicemail on an iPhone.
From the home screen select ‘Phone’, and
simply dial 1760,
a message at the end of the line will confirm voicemail’s been switched off.
To turn it back on simply dial 1750,
again a message at the end of the line will confirm it’s been switched back on.
There you go, that’s all there is to it.