Contacts and Calendar for Windows Phone 8
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Windows Phone provides two different ways your app can integrate with the contacts experience on the phone. One method, which was supported in previous versions of Windows Phone allows provides you with read-only access to the phone’s contact store and calendar. Use this method to allow the user to search for existing contacts or appointments. The second method, which is new in Windows Phone 8, allows you to create a custom contact store for your app. There are APIs for adding, updating, querying, and deleting contacts in your custom store, as well as APIs to help implement synchronization of your local contact store on the phone with a remote contact store on the cloud. The contacts you create in your custom store are visible in the built-in phone experience and other apps. For information on these two ways of incorporating contacts into your app, see the following sections:
Custom contact store for Windows Phone 8
Read-only access to Contacts and Calendar for Windows Phone 8
Reference
Windows.Phone.PersonalInformation