xamarin.forms - How to use Phone control Event such phone ring -

i remember there phone.control in window phone.

microsoft.phone.controls has obscured event triggered whenever shell chrome covers frame of windows phone

i used below code implement in windows phone7.5  (application.current app).rootframe.obscured += onobscured; (application.current app).rootframe.unobscured += onunobscured; 

problem: can these implemented in xamarin forms ios , droid phone?

thanks