H25A CREW ENTERED PHX CLASS B AIRSPACE WITHOUT CLRNC ON DEP AT SDL.

Narrative

WHILE WAITING TO DEPART SDL ON AN IFR FLT PLAN; OUR DEP WAS DELAYED ON THE GND DUE TO TFC. WE ADVISED SDL TWR THAT WE COULD GIVE THEM A VFR CLBOUT. OUR INTENTION WAS; WE COULD MAINTAIN OUR OWN TFC SEPARATION WHILE OBTAINING IFR CLRNC AIRBORNE. SDL TWR APPARENTLY THOUGHT THAT WE INTENDED TO CANCEL OUR IFR FLT PLAN. SDL TWR CLRED US FOR DEP AND TOLD US TO SQUAWK VFR. AFTER SQUAWKING VFR ON THE CLBOUT WE QUESTIONED SDL TWR IF WE WERE TO REMAIN ON THE PREVIOUSLY ISSUED BANYO.4 DEP. THE TWR REPLIED 'YES; PICK UP YOUR CLRNC WITH PHX DEP.' WE CONTACTED PHX DEP AND WERE SURPRISED BY THE INSTRUCTIONS TO 'CLB VFR AND REMAIN CLR OF THE CLASS B AIRSPACE.' WE IMMEDIATELY PULLED OUT THE VFR CHART TO DETERMINE THE APPROPRIATE CORRIDOR. WITHIN MOMENTS; PHX DEP ADVISED US TO 'DSND IMMEDIATELY TO 5000 FT;' WHICH WE COMPLIED WITH. IT IS MY BELIEF THAT A MISCOM WITH SDL TWR PROMPTED THIS SIT. WE NEVER INTENDED TO CANCEL IFR; AND WERE TOLD TO SQUAWK VFR ON THE TKOF CLRNC. IN RETROSPECT THE TWR SHOULD HAVE CONFIRMED OUR INTENTIONS RATHER THAN ASSUMING.