你好，
据我所知，从WP7开始，手机的应用就可以访问到联系人列表。这个API应该在WP7就开放出来了。
http://msdn.microsoft.com/zh-cn/library/windowsphone/develop/hh286416(v=vs.105).aspx
如果你不希望这个API被公开，可以在下面的链接中提交你的想法，
http://windowsphone.uservoice.com/forums/101801-feature-suggestions
谢谢！
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