I have a question if there are any ATC types on freq. I fly out of KSDL. PHX has a class B. There is a VFR corridor just to the east or west of the airport. As you come out of the Corridor heading Northbound. your about 5 miles from the border of KSDL's class "D". Sometimes the controller will say. ( Squak VFR radar service terminated) I know this means I know need to make a cold call to Scottsdale Tower. Or coming off the corridor you will get " Keep your beacon code, have a good day." I have had them say this, and Assuming there handing me off. I will contact twr. Cessna 123ABC checking in 5 S/W. but come to find out I am not handed off. So I then treat it like a cold call. But then again. Sometimes I am handed off. Anyone in PHX area have this happen?