How can we get Mobile No. of Android Device in xamarin forms

Can we get Mobile No. of Android Device in Xamarin forms
This code didn't worked
Android.Telephony.TelephonyManager tMgr = (Android.Telephony.TelephonyManager)Forms.Context.GetSystemService(Android.Content.Context.TelephonyService);
return tMgr.Line1Number;
this code return "";