PLT OF AN SEL SMA FLEW VFR IN IMC ON FINAL AFTER CANCELING HIS IFR CLRNC WHEN GOING BELOW APPROVED APCH MINIMUMS AND THEN RE-ESTABLISHING HIS IFR CLRNC PRIOR TO LNDG BECAUSE OF FOG.

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I HAD ALMOST COMPLETED AN IFR FLT FROM MYRTLE BEACH; SC; TO BRUNSWICK; GA; MALCOLM MCKINNON ARPT. I DO NOT REMEMBER MY CONVERSATION WITH THE APCH CTLR VERBATIM BUT AFTER INSTRUCTING ME TO HOLD AT THE BRUNSWICK VOR I WAS CLRED FOR THE VOR APCH TO RWY 4. I DO BELIEVE THAT I WAS INFORMED THAT I COULD CANCEL IFR WHEN I HAD THE RWY IN SIGHT OR BY TELEPHONE AFTER I HAD LANDED. AS I WAS DSNDING THROUGH 1100 FT; I SAW THE GND; RECOGNIZED WHERE I WAS AND CANCELED MY IFR CLRNC. SINCE THERE WAS SCUD IN THE AREA AND I WANTED TO BE VERY LEGAL; I ASKED APCH TO RE-ESTABLISH MY IFR CLRNC. THEN I PROCEEDED TO LAND SAFELY AT MY DEST. I HAD BEEN TOLD TO CALL ZJX. AFTER LNDG; I TRIED TO REACH THEM BY RELAYING A CALL THROUGH MACON FSS. AFTER DEPARTING SSI IFR; ZJX GAVE ME A PHONE NUMBER TO CALL. I TRIED TO REACH THEM WHEN I ARRIVED HOME AT XX05 BUT WAS UNABLE TO DO SO. I CALLED AGAIN THE FOLLOWING DAY AND THE INDIVIDUAL I SPOKE WITH INFORMED ME I HAD BROKEN MINIMUMS AND THAT I WOULD HEAR FROM THE ATLANTA DISTRICT OFFICE AFTER THEY REVIEWED THE TAPES. CONTRIBUTING FACTORS WERE DIFFICULTY HEARING CTLR'S INSTRUCTIONS AND AN ANXIOUS PAX; ALSO MY PROCLIVITY TO USE THE RADIO INSTEAD OF THE TELEPHONE FOR CANCELING IFR.