https://blog.wongcw.com/2019/09/12/4gb%e9%82%84%e6%98%af6gb%ef%bc%9fiphone-11-pro%e9%81%8b%e5%ad%98%e7%a9%b6%e7%ab%9f%e5%a4%9a%e5%a4%a7%ef%bc%9f/