A PLT DSNDED INTO SDL CLASS B AIRSPACE WITHOUT A CLRNC.

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HOW PROB AROSE: I WAS ENRTE FROM APPLE VALLEY; CA; TO SCOTTSDALE; AZ. I WAS WITH ZAB FLT FOLLOWING WITH HDOF TO LUKE AFB APCH CTL. I WAS AT 9500 FT VFR. LUKE ADVISED ME THAT PHX APCH WANTED ME TO DSND TO 5500 FT AT SUN CITY. I DSNDED TO 5500 FT. AGAIN; LUKE ADVISED ANOTHER HDG OF 070 DEGS. I THEN WAS HANDED OFF TO PHX APCH CTL. HE TOLD ME WHAT I THOUGHT WAS A CLRNC TO DSND TO 4000 FT OR LOWER. I THINK I REPEATED 4000 FT OR LOWER. I WAS WATCHING DEER VALLEY ARPT COME INTO VIEW ON MY L WING. I DECIDED TO TURN MORE S AWAY FROM DEER VALLEY ARPT WHICH WOULD ALSO TAKE ME CLOSER TO SCOTTSDALE ARPT ABOUT 8 MI DISTANCE. THAT TIME I WAS DSNDING AND RECEIVED A CALL FROM APCH CTL TELLING ME I WAS SUPPOSED TO BE AT 4000 FT OR HIGHER. I CLBED BACK TO 4000 FT AND APCH TOLD ME TO TELEPHONE DEER VALLEY ARPT WHEN I LANDED. APCH TOLD ME TO SQUAWK 1200 AND GO TO SCOTTSDALE TWR. I CALLED DEER VALLEY AND THEY WANTED INFO TO INVESTIGATE MY INCURSION INTO THEIR AIRSPACE. THEY SAID THEY WANTED TO COORDINATE THE INVESTIGATION WITH APCH CTL. I GOT THE IMPRESSION THAT APCH CTL DOESN'T TALK TO DEER VALLEY TWR TO TELL THEM WHEN AN ACFT IS IN THEIR AREA AND UNDER PHX APCH CTL. I DID NOT VIOLATE CLASS B AIRSPACE AT ANY TIME. I THOUGHT THAT I WAS UNDER PHX APCH CTL AND WAS CLRED IN THE AIRSPACE IN WHICH I WAS FLYING. I DID NOT THINK I HAD TO ASK APCH CTL IF I WAS CLRED INTO DEER VALLEY ARPT AIRSPACE. FOR FUTURE FLTS IN LARGE CITIES WITH MULTIPLE ARPTS; I WILL VERIFY CLRNC TO FLY OVER ANY ARPT WHILE WITH APCH CTL. I ALSO THINK APCH CTL SHOULD HAVE NOTIFIED ME IMMEDIATELY WHEN I DSNDED BELOW 4000 FT; BECAUSE THERE WAS AT LEAST 2 MINS OR MORE OF ELAPSED TIME BEFORE APCH CTL ASKED ME WHY I WAS BELOW 4000 FT. TO PREVENT RECURRENCE OF THIS TYPE OF INCURSION I WILL BE MORE ALERT TO ARPTS AND QUESTION ANY CLRNC THAT WOULD PUT MY ACFT IN VIOLATION OF THE ARPT AIRSPACE. I THINK PHX APCH SHOULD COORDINATE WITH ARPTS WHEN CTLING ACFT IN THE VICINITY OF ARPT AIRSPACE.