Here was my experience at the Apple store.
I'd signed up for a 4:30 time at the genius bar, so I went to the mall to do my Christmas shopping beforehand.
I walk in at 4:21 and I'm second on the waiting list.
"Linda?"
"Linda?"
"Linda?"
"Paul?"
I explain the situation and the guy says I have a hardware problem where one of the sensors went out causing the whole row to go out. He gets a new phone (not refurb'd, I asked), puts in my sim card, activates it, and hands it to me.
I walked out at 4:27 with a brand new, fully functioning and activated phone. I know it was 4:27 because I was so stunned I had to check my watch 🙂
Great stuff.