https://blog.wongcw.com/2018/12/18/t-mobile%e7%be%8e%e5%9c%8b%e6%94%b6%e8%b3%bcsprint%e9%80%b2%e4%b8%80%e6%ad%a5%ef%bc%9a%e7%8d%b2%e7%be%8e%e5%9c%8b%e5%ae%89%e5%85%a8%e9%83%a8%e9%96%80%e6%89%b9%e5%87%86/