Hammering nails with a smartphone - the less popular "Will it blend?", perhaps because few phones can actually make through it. The Oukitel K4000, a phone with a 4,000mAh battery and apparently a rock-hard forehead, drove several nails - some of them really thick! - into a piece of wood. All with no visible damage to the phone too, the touchscreen keeps working after colliding face first with all the nails. The screen isn't covered in anything outlandish, it uses Corning Gorilla Glass 3. Still, it can take on the second half of the hammer-and-nail pair - the hammer! Oukitel also says the K400 can crack 600 walnuts, no problem. Not that you should try that, but you don't need to be gentle with the handset either. PS. the Oukitel isn't the first phone to hammer in nails - here's the 6.65mm thick Oppo Finder doing it, we've also seen HTCs and (naturally) Nokias do it...
Source: http://www.gsmarena.com/hammer_time_oukitel_k4000_meets_nails_lives_to_tell_the_tale-news-14049.php
