If you have maps that are stored on a mobile content server, and you want to access those maps using ArcGIS for Windows Phone, add a connection to the mobile content server by taking the following steps. Then you will be able to browse and open the available maps.
The servers settings page displays.
The Add Content URL page displays.
For example, http://arcgismobile.esri.com.
You are taken back to the servers settings page. Your recently added server is included in the list of servers.