Oh my god GOSH!!! I got hurt due to smart phone. Actually I finished my exercise in the gym, and I wanna come back home. Meanwhile I tried to communicate with one of my friend, so I was chatting with him with WHILE walking. When I almost arrived near my home, I met the stair A STAIRCASE. And I felt it I should be careful and went down step by step SO I CLIMBED DOWN CAREFULLY WITH EVERY STEP. BTW the end of stair has some slope BY THE WAY, THERE WAS A SLOPE AT THE END OF THE STAIRCASE, I thought the area of stair is finished. So I looked at my smart phone again and i started walking. But the middle of slope had another stair, finally I fell down in that area. I was wounded to my knee. It was so painful, my jean had a hole I EVEN HAD TORN JEANS. Anyway the accident has been occured OCCURRED, I should be careful for watching smart phone on the street.