Just set up a test alarm about 35 mins later from the time when testing begun. Phase time is 30 mins. Put the phone upside-down. Then I waited for about 6-7 mins, and tried shaking the phone a bit, then more violently - it didn't sound a wakeup alarm. How come?
When testing, the g-sensor works. The graph says clearly that I made some movements with the phone. But no wakeup sound.
EDIT 2: Just tested it during the night. The g-sensor was not working at all, I am looking at the graph. No movements were detected at all. I guess this happens because the screen is turning off when I press "Sleep". But how can I use it then?! Should I let the screen on all night?! No logic in that.
I have Omnia i900, WM 6.1