https://blog.wongcw.com/2022/01/15/2g%e7%b6%b2%e7%b5%a1%e6%bc%8f%e6%b4%9e%e5%a8%81%e8%84%85%e5%a4%a7%e6%96%b0%e7%89%88android%e5%8a%a0%e5%85%a5%e9%96%8b%e9%97%9c%e5%85%81%e8%a8%b1%e7%94%a8%e6%88%b6%e6%89%8b%e5%8b%95%e9%97%9c%e9%96%89/