它没有sim卡，允许在互联网上保存和同步联系人。
It has no SIM card and allows contacts to be saved and synchronized on the Internet.
如果你有一个免费账户，有同步联系人的想法但是想看看是否值得这么做，如果好的话为啥不利用一下呢？
If you've got a free account, loved the idea of contact sync but want to see whether it's worth it then why not take advantage?
为了演示使用中的脱机应用程序，这里给出了一个同步的联系人示例。
To illustrate an offline application in action, a synchronized contacts sample is provided.
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