Removing (disabling) & re-enabling Voicemail service on Anytime package

[#1]

Hi,
I have a quick question:
I currently have the Voicemail (1571) service enabled on my "Anytime" Home Phone package (it was included as a zero cost feature), but would like to disable it (for now at least - which I understand I can do from the "Remove call features" link of the "Call Features" tab in the Home Phone Control Panel [see: https://portal.plus.net/plustalk/index.php?page=wlr_remove_call_features]) so that I can use my new BT8500 cordless phone base station for answering calls.
The question is: Is it possible to easily re-enable this service (without having to pay extra fees etc) at a later date if I need to? It seems to be a standard included feature of the Anytime package, but I'm a bit unclear on how easy it would be to re-enable again should I need to  - and also if it would remain a free-of-charge option.
Many thanks.
Kind regards,
Adam.

[#2]

Voice Mail is always free unlike Voice Mail Extra which isn't

[#3]

Many thanks OldJim!  
I can now remove the basic 1571 Voicemail service (I don't need the extra functionality of Voicemail Extra right now, as this is handled by the BT8500 phone units), in the knowledge that I can always re-enable it in the future, if I should need to.
Kind regards,
Adam.