有3种不同的类别...

there are 3 different categories ...

1. 支持和记录功能
2. 提供功能未记录
3. 在功能无法使用

因此​​，双卡双待功能也有，但没有记录，因此没有正式支持。

So the dual sim features are available but not documented and hence not officially supported.

尽管如此，这并不意味着它不会是有用的，它只是意味着机器人（或为此事谷歌甚至manufaturer）不承担责任，以支持您的应用程序的功能。

Having said that it doesn't mean that it will not be usable , It just means that android(or for that matter google or even manufaturer) is not liable to support your apps functionality.

但它也可能只是工作，对于如接触是类似的事情。

But it might just work , for eg the contacts is a similar thing.

您可能会再请教了如何将每个人都知道的功能，如果在情况下，它没有记录..嘿Android是开源..去看看code和发现它自己。那是什么我想多SIM开发商做了。

You might then ask up how would everyone know about the features if in case its not documented.. Hey android is open source .. go look into code and find it for yourself . Thats what I guess the multi sim developers did.