How open phone app in windows phone

hi , how i can open 'phone' application in windows phone from my app ?
how i can use this code for open :
await Windows.System.Launcher.LaunchUriAsync(new Uri(""));
please help for solve this

Refer following link
https://msdn.microsoft.com/en-us/library/windows/apps/hh394021(v=vs.105).aspx
In Windows Phone 8.1 Runtime you can try ContactPicker
https://msdn.microsoft.com/en-in/library/windows/apps/windows.applicationmodel.contacts.contactpicker.aspx
Gaurav Khanna | Microsoft .NET MVP | Microsoft Community Contributor

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