Some friends buy e-book readers, hoping to have all functions, the more the better. In fact, this is a typical misunderstanding. The main function of an e-book reader is to read books, just like a mobile phone, mainly for making calls. Some mobile phones have many additional functions, and some friends may experience it. Phone calls, sending and receiving text messages, and other camera and radio functions are rarely used. Mobile phones can also use MP3 to read TXT novels, but how many people use their mobile phones to listen to MP3s and read novels. At most, they use them occasionally when they are bored.