We have our first long haul in two years coming up at the end of March. I do recall hearing these announcements before - but it seems like a long time ago! Pre-smart phones, the biggest C-class seat problem I had was the failure of the personal reading light on LH (a 343, I think it was) and the CC were brilliant. Asked me to step out for a moment and then attacked the unit. After a few minutes I told them not to worry but they persisted and got it working. So I am confident they would find a wayward phone.