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How to get the UniqueID of the Windows Phone device using C# ?

In Windows Phone 7 , the developers can take advantage of the class DeviceExtendedProperties to get the unique id of the device .

The DeviceExtendedProperties which is part of the Microsoft.Phone.Info assembly also can be used to retreive the total memory , memory usage ,Device Name , Firmware version , hardware version etc and few other device information .

Below is a sample sourcecode that lets you get the uniqueid of the Device . It uses the extended device property list “DeviceUniqueID” to retreive the unique ID

object DeviceUniqueID;

byte[] DeviceIDbyte=null;

if (DeviceExtendedProperties.TryGetValue("DeviceUniqueId", out DeviceUniqueID))

DeviceIDbyte = (byte[])DeviceUniqueID;

string DeviceID = Convert.ToBase64String(DeviceIDbyte);


You should add the below entry to your WMAppManifest.xml file of your WP7 Project to actually get the Unique ID

When the above entry is missing in the xml file , you will get an UnauthorizedAccessException or Argument null Exception “Value can not be null.”

Reference : Device Information for Windows Phone

Senthil Kumar B
Senthil Kumar is a former Microsoft MVP (Most Valuable Professional). He is a Co-Author of the book "Windows 10 Development Recipes using JavaScript and CSS" for Apress Publication. He is a technical presenter, blogger, mentor and a Geek.  Senthil is a regular speaker is various local user groups. He has presented at conferences like Great Indian Developer Summit (GIDS) & Microsoft DevCamps. You can reach out to him via his Twitter handle @isenthil.