Woo, found it.

I'd lost my phone under a pile of crap when tidying my room recently, and as a result I'd not got the reminders about Biphoria (which I missed) and the battery had gone a wee bit flat.

At least voicemail is now working; it seems as though it wasn't working since I got back from Hungary. At least that explain why I'd not got any voicemail message for a while.