A GA C152 PLT ENTERS CLASS D AIRSPACE BEFORE CALLING THE ATCT LCL CTLR.

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LCL DAY VFR FLT FROM LVK-PAO. RECEIVED FLT FOLLOWING AND SQUAWK CODE FROM BAY APCH 135.4 OVER SUNOL GOLF COURSE AT APPROX 3500 FT MSL. BAY APCH CTLR SAID 'CESSNA CALL SIGN; SQUAWK XXXX AND IDENT.' I COMPLIED AND HE SAID 'CESSNA CALL SIGN; RADAR CONTACT; SQUAWK VFR WHEN YOU HAVE ARPT IN SIGHT (PAO); GOOD DAY.' I ACKNOWLEDGED AND DSNDED TO 1300 FT MSL OVER DUMBARTON BRIDGE TOLL PLAZA TO REMAIN CLR SFO CLASS B AND SJC CLASS C. I CONTINUED OUT OVER THE SFO BAY ALONG 222 DEGS TO OSI VOR INBOUND TO PAO. I EXPECTED TO BE HANDED OFF; BUT WHEN I WAS ABOUT 3 MI OUT (INSIDE PAO CLASS D) NO ONE CALLED ME. I SQUAWKED VFR AND CALLED PAO TWR. THEY GAVE ME LNDG INSTRUCTIONS AND INFORMED ME I HAD ENTERED CLASS D AIRSPACE BEFORE ESTABLISHING 2 WAY RADIO COM. I LANDED WITHOUT INCIDENT AND TAXIED TO TRANSIENT. THEY DIDN'T TELL ME TO CONTACT TWR AFTER LNDG. HOWEVER; I TRIED TO CALL THE TWR THE NEXT DAY; BUT ONLY WAS ABLE TO LEAVE A VOICE MESSAGE. NO RETURN CALL. AS I LOOK BACK ON THE SIT I THINK THE CTLR WANTED ME TO CALL PAO BEFORE ENTERING THE CLASS D. HOWEVER; AT THE TIME THERE WAS A LOW LEVEL HAZE (1000 FT OR SO) AND WHILE THE VISIBILITY WAS OVER 5 MI I DIDN'T SPOT THE FIELD UNTIL INSIDE THE CLASS D (FIRST TIME TO PAO). THIS COULD HAVE BEEN AVOIDED IF THE CTLR INSTRUCTED ME TO SPECIFICALLY REMAIN CLR PAO CLASS D UNTIL ESTABLISHING 2 WAY COM.