Hi there cleopat2,
I take it you want to remove it from your Mobile service?
You can do this in a number of ways. Just choose the option that best suits you!
Once you've completed the steps below, it will take 15 minutes to 4 hours for the changes to take effect.
Keep in mind that the free Missed Call Service will automatically activate once you've removed voicemail. You can turn off the Missed Call Service as well by simply sending an SMS with the word 'OFF' to 159 from your Mobile.
This option will only work if you're on a Postpaid service.
To add voicemail on a PC, log into My Account.
Please see here if you want it gone for your fixed service.