couldn't find latitude and longitude of my iphone

i am trying to find out iphone's current location and for this I am using this method. and try to save it for further procedure. but when I print value of location in form of latitude and longitude It always giving me 0.00000 and 0.0000. I am not getting the point that where I am wrong.this method is save in GetLocation class.i am trying to find out iphone's current locati