A VFR PIPER PA24 PLT HAD A LATE FREQ CHANGE FROM DAB TO MCO AND WAS ALREADY IN THE CLASS B AIRSPACE.

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I WAS IN CONTACT WITH DAYTONA APCH CTL ON THE WAY TO MCO AND WAS WAITING FOR TURN OVER TO ORLANDO APCH CTL. I CALLED DAYTONA APCH CTL AND SAID I THOUGHT I WAS GETTING CLOSE TO ORLANDO; AND SHE REPLIED SHE FORGOT ABOUT ME AND GAVE ME THE CHANGEOVER FREQ. ON CONTACT WITH ORLANDO APCH CTL; HE SAID I HAD ENTERED HIS TCA WITHOUT COM; I WAS THEN TURNED OVER TO ANOTHER CTLR WHICH GAVE ME VECTORS; HE ASKED IF I HAD THE ARPT IN SIGHT. I TOLD HIM I HAD MCO IN SIGHT AND HE SAID CLRED FOR THE VISUAL AND LAND RWY 18R NO LOWER THAN 2500 FT S OF THE VOR. AFTER REACHING THE VOR AND TRYING TO ASK TO SWITCH TO TWR ON FINAL SHE WAS VERY BUSY; SO I SWITCHED TO TWR. DOWN FINAL; I TRIED NUMEROUS TIMES TO CALL TWR AND COULD NOT GET THEM. I THOUGHT FROM THE CLRNC GIVEN BY APCH AND NO ACFT ON RWY OR TXWYS AND TFC BEHIND ME; I THOUGHT THE SAFEST THING TO DO WAS LAND AND CLR ASAP. ONCE CLRING THE RWY; I FINALLY GOT GND CTL WHICH ASKED IF I HAD SPOKEN TO TWR? I TOLD HIM I WAS HAVING RADIO TROUBLE AND WAS CLRED TO RAMP. ON POSTFLT MAINT INSPECTION REVEALED THE RADIO COM XFER SWITCH WAS FAULTY WHICH HAS BEEN CORRECTED. I FEEL I DEPENDED ON DAYTONA APCH TOO MUCH TO RELEASE ME IN TIME FOR ORLANDO TCA. I SHOULD HAVE CONTACTED ORLANDO APCH OR ASKED DAYTONA TO SWITCH ME EARLIER. IN THE FUTURE; I WILL DO A MUCH BETTER JOB OF FORETHOUGHT.