Allow me to draw your attention to this Windows Phone application Certification Requirement:
Requirement 2.7.2 The privacy policy of your application must inform users about how location data from the Location Service API is used and disclosed and the controls that users have over the use and sharing of location data. This can be hosted within or directly linked from the application.
Should you submit an application that uses Location Service API and do not provide a privacy policy you will get a friendly response from the certification something like this:
Fail: It appears the application uses location services but does not include a privacy policy describing how the application uses the Location Service API and what control users have over the usage and sharing of information obtained through that usage.
解决方法：http://blog.jerrynixon.com/2012/02/wp7-sample-use-location-services-and.html
简要的说就是应用程序需要提供关闭或开启位置服务的设置（注意：这个设置只是针对应用程序本身，不是设置手机中的定位服务），提供设置的同时需要有隐私声明，向用户说明你获取位置的目的，承诺不会向第三方透露位置数据，我的隐私声明是：
隐私声明：此应用程序将使用您的当前位置，仅用于获取您所在位置附近的商家和好友，增强用户体验，除此之外，我们决不会向任何第三方透露您的位置数据，请放心使用。您也可以禁用定位服务。如果您有任何疑问，请联系douliu@douliu.com。