I hate nearly everything about the Z10.
The interface seems to be based on random swiping with no visual cues on where to go and it's not consistent. Try swiping left or up to look at an email when you're on a call and you get cut off, but from other apps or screens you can. Sometimes I swipe left, I get the hub, sometimes it will be email, texts...
Even from the lock screen, usually it lets me tap an email notification and enter my PIN and I'll go straight to the mail, other times it won't acknowledge and eventually tell me I have to swipe up. The phone is full of idiosyncrasies like this.
Everyone at our place hates them and we are all pushing for a switch to Android/iOS.
Anyway, it still works after a couple of years I suppose.