OPDEV OCCURRED WHEN NORCAL APCH CTLR WORKING A TFC WATCH C172 ENTERED SFO CLASS B AIRSPACE WITHOUT COORD.

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AT XA50 ON DEC/WED/03 I WAS FLYING TFC WATCH AND OVER RICHMOND; CA. I CALLED NORCAL 120.9; GAVE POS RPT AND ASKED FOR ADVISORIES. RTE WAS TO BE HWY 80 S; BAY BRIDGE THEN RTE ALPHA THROUGH SFO CLASS B AIRSPACE. NO SQUAWK CODE WAS GIVEN AND I REMAINED ON CODE 1200. AFTER XING THE BAY BRIDGE; I REQUESTED A BRAVO CLRNC AND WAS CLRED INTO BRAVO. AT HOSPITAL CURVE; I ASKED IF A SQUAWK CODE WAS NEEDED TO ENTER BRAVO. NORCAL ON 120.9 SAID CURRENT SQUAWK WAS OK (1200) AND 'YOU ARE CLRED INTO BRAVO.' I CONTINUED DOWN HWY 101 AS USUAL TOWARD SFO AND WAS GIVEN 2 ACFT TA'S AS I PASSED SFO ARPT. WHEN I REACHED SAN CARLOS ARPT AT 2000 FT; I ASKED TO TERMINATE ADVISORIES. NORCAL ASKED FOR MY POS AND I SAID ABEAM SAN CARLOS. NORCAL CAME BACK AND SAID; 'RADAR SVCS TERMINATED; SQUAWK 1200.' I THEN CALLED PALO ALTO TWR AND REQUESTED TRANSITION HWY 101 S. TWR SAID 'IDENT.' I DID; AND HE SAID 'TRANSITION APPROVED' AND TO COPY SFO TWR PHONE NUMBER AND CALL THEM WHEN I GOT ON THE GND. THEY GAVE ME THE ADMINISTRATION NUMBER; SO I DID NOT TALK TO SFO TWR. I THEN CALLED PALO ALTO TWR AND HE SAID HE TALKED TO SFO TWR AND IT WAS NORCAL'S MISTAKE AND NOT TO WORRY.