A C182 PLT; ON AN ADIZ FLT PLAN; SQUAWKING THE ASSIGNED CODE; WAS VIOLATED FOR ENTERING THE DC ADIZ WITHOUT PERMISSION.

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I FILED AN ADIZ FLT PLAN WITH ELKINS FSS FOR A DEP FROM MD24 TO WILMINGTON; DE. FOR THE RETURN FLT TO MD24; THE FAA SPECIALIST RECOMMENDED FILING A FLT PLAN TO BE ACTIVATED OVER EMI. THIS WAS DONE WITH AN ESTIMATED ARR TIME AND ESTIMATED RETURN TIME. I TRIED SEVERAL TIMES TO CALL POTOMAC APCH ON THE ASSIGNED FREQ (128.7) PRIOR TO REACHING EMI. FINALLY POTOMAC APCH RESPONDED AND I WAS TOLD TO CONTACT POTOMAC APCH ON 126.725. THE CTLR ON THIS FREQ WAS ALSO VERY BUSY HANDLING TFC; SOME FOR WHICH SHE WAS HAVING DIFFICULTY LOCATING ADIZ FLT PLANS. I FINALLY GOT A BREAK; CALLED; AND WAS ASSIGNED A SQUAWK CODE. I IMMEDIATELY CHANGED COURSE AND HEADED FOR MD24. THE CTLR THEN ASKED WHETHER I HAD FILED AN ADIZ FLT PLAN. I RESPONDED AFFIRMATIVELY; BUT WAS THEN DIRECTED TO STAY CLR OF THE ADIZ AND PREPARE TO COPY A PHONE NUMBER. I CHANGED COURSE TO AVOID THE ADIZ; COPIED THE PHONE NUMBER; AND WAS THEN CLRED TO MD24. ON THE GND; I CALLED THE PHONE NUMBER AND WAS TOLD THAT I HAD PENETRATED THE ADIZ WITHOUT AUTH. I WAS; AND AM; UNAWARE OF ANY UNAUTH PENETRATION. MY CELL PHONE RECEPTION WAS POOR; BUT I BELIEVE THE INFRACTION WAS SAID TO OCCUR 30 MI W AS I WAS TRACKING INBOUND TO EMI. THAT IS POSSIBLE; SINCE THE DIRECT RTE FROM WILMINGTON TO EMI PASSES WITHIN A COUPLE OF MI OF THE ADIZ BOUNDARY. THAT INCURSION; IF IT OCCURRED; WAS CERTAINLY INADVERTENT. GIVEN THE IMPORTANCE OF THIS MATTER; I SHOULD HAVE CHOSEN A RTE FURTHER FROM THE ADIZ BOUNDARY AND BEEN DILIGENT ABOUT THE PRECISION WITH WHICH I FOLLOWED IT.