Night, the mobile phone is like crazy, constantly sending text messages, until daybreak, automatically shut down due to power outage. At this time, the mobile phone has sent more than 4700 text messages, on average one every four or five seconds. Yesterday, Xiao Yang, a student at Tianjin Normal University, held a thick printed text message list and reported her helplessness to the "night reporter station" of our newspaper. Xiao Yang introduced that she spent nearly 3000 yuan to buy a Nokia N7370 mobile phone on April 1 last year. The use before was normal, no similar problems appeared. On the evening of December 31st last year, she used this mobile phone to send dozens of New Year greeting text messages to some classmates and friends. Around 24 o'clock, she put the mobile phone aside and went to bed.