https://blog.wongcw.com/2018/10/23/imessage%e6%b2%a1android%e7%89%88%ef%bc%9f%e8%8b%b9%e6%9e%9c%e6%9c%80%e5%88%9d%e4%b9%9f%e4%b8%8d%e6%83%b3ios%e7%8b%ac%e5%8d%a0/
iMessage没Android版?苹果最初也不想iOS独占