I was so bored at my home during the last summer vacation. I tried to find something fun for boots my feeling, but i couldn't get it. So I just played something in my smart phone such as checking Facebook timeline or playing candy crush game. Then I had a wrist pain. The doctor told me that I was a wrist sprain because I always took the smart phone in my hand. After that I changed my routine. I watched Korea drama on the television instead of playing smart phone, and my wrist pain was better. Finally, I want to warn you about this. Smartphone can make you fun, but sometimes it can make a pain too.