Why do you always say that the information in my mobile phone memory accounts for 13MB?

You didn't make it clear, but with the ability of N8 1, the mobile phone itself, memory card and running memory must be more than 20M. If it's the memory of the mobile phone itself, you really want to get bigger, then pick up the computer and you can see it at a glance! Seeing these things on you. If you don't need a computer, use your mobile phone and download a manager on the Internet, such as FExplorer. You can also use them to manage mobile phones, and the resources occupied by SMS can be found ~ and then deleted or transferred to the memory card.