Update: Chris from O2's social team commented on the omission of the "Hey Cortana" passive-listening feature, stating that the carrier was looking into it:
Everybody, I'm sorry I didn't give a heads up that the Denim update for Lumia 635, 930 & 1520 would be going live last night - I received notification that this would be going live yesterday. It was a day off and I was unwell so hadn't seen it until today.
I understand many of you are unhappy around an issue with Cortana functionality being missing - please leave this with me and the device team, we'll find out what the issue is and report back.
I understand many of you are unhappy around an issue with Cortana functionality being missing - please leave this with me and the device team, we'll find out what the issue is and report back.
Full story from the WindowsCentral blog...