Solution: Use CultureInfo.CurrentUICulture
The user can change the system language of Windows Phone at: Settings> language + region> Phone language
How can I get the selected language (phone language) from C # code?
Below are the settings of my phone:

Here is my code snippet:
System.Diagnostics.Debug.WriteLine( "************************************* CultureInfo.CurrentCulture.Name = " + CultureInfo.CurrentCulture.ToString() + ", " + "CultureInfo.CurrentCulture.CompareInfo = " + CultureInfo.CurrentCulture.CompareInfo + ", " + "CultureInfo.CurrentCulture.DisplayName = " + CultureInfo.CurrentCulture.DisplayName + ", " + "CultureInfo.CurrentCulture.EnglishName = " + CultureInfo.CurrentCulture.EnglishName + ", " + "CultureInfo.CurrentCulture.Name = " + CultureInfo.CurrentCulture.Name + ", " + "CultureInfo.CurrentCulture.NativeName = " + CultureInfo.CurrentCulture.NativeName + ", " + "CultureInfo.CurrentCulture.TextInfo = " + CultureInfo.CurrentCulture.TextInfo );
Here is the result:
CultureInfo.CurrentCulture.Name = zh-HK, CultureInfo.CurrentCulture.CompareInfo = CompareInfo - zh-HK, CultureInfo.CurrentCulture.DisplayName = Chinese (Traditional, Hong Kong SAR), CultureInfo.CurrentCulture.EnglishName = Chinese (Traditional, Hong Kong SAR), CultureInfo.CurrentCulture.Name = zh-HK, CultureInfo.CurrentCulture.NativeName = 中文(香港特別行政區), CultureInfo.CurrentCulture.TextInfo = TextInfo - zh-HK
I can not find "Phone language"
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