assuming see level the dimensions and mass on gsmarena and laminar flow . and a drag coefficient of 1.28, the terminal velocity is around 50 km/h or 30 mph assuming 16 stories is enough to reach that velocity of course. to OP hows the body, any dents? i have on the corner of mine and my gf's lumia 900 too. i just bought a new case to replace it for 40 usd