07-03-2019 2:24 PM - edited 07-03-2019 2:28 PM
Log into your member centre - https://www.plus.net/member-centre/login
Look for the phone tab - https://www.plus.net/plustalk/index.php?page=wlr_my_account
Click call features - https://www.plus.net/plustalk/index.php?page=wlr_add_call_features
From there, I'm not too sure as I already have it (it's free btw;)), but probably tick the box and see if a confirmation box pops up.
(check and T's and C's too before committing)
edit, possibly hit the add features button (red arrow)
Re: Caller id
For future reference, from the 'call feature' tab, you should also see 'remove call features' in blue. If you ever wanted to remove features, if for example you click one by accident, then click that one too ;). I'd thought I'd point that out as imho it's easily missed!