我的iPhone 6s plus以前是ATT plan. 刚搞了个sprint sim card. 从一个ringplus
plan swap过来时，显示swap成功。但是turn on手机，activation出错：
The Sim card that you currently have installed in this iphone is from a
carrier that is not supproted under the activation policy that is currently
assigned by the activation server. This is not a hardware issue with the
iphone. please insert another sim card from a supported carrier or request
that this iphone be unlocked by your carrier. please contact apple for more
information.
怎么办呢？谢谢。
