We'll be moving some lines form "C" to "D" tonight after an issue early this morning. Later in the week we expect to do a rolling LNS upgrade over several nights. As usual this will be a PPP restart. You can set preferred time of night on the control pages.
It is likely that the automated system to move lines from "C" to "D" will not work so this may be done in one go during the night or early morning. The knock on effects of the RADIUS issues early this morning have also caused to free usage, and some unexpected "line down" emails/texts/tweets. Sorry for any inconvenience.