MD80 CABIN ATTENDANT RPTS PAX WOULD NOT TURN OFF LAPTOP COMPUTER ON DSCNT AND WAS TALKING ON MOBILE DEVICE BEFORE LNDG.

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PAX HAD A RED FLASHING LIGHT ON HER LAPTOP AFTER REQUESTING OVER PA ALL ELECTRONICS TO BE TURNED OFF. I APCHED HER AND ADVISED HER THE DEVICE NEEDED TO BE TURNED OFF; SHE SAID IT WAS. I AGAIN SAID THE PWR NEEDED TO BE TURNED OFF; SHE SAID IT WAS. I SAID IF THE DEVICE WAS OFF THERE WOULDN'T BE A RED FLASHING LIGHT. I SAID EVEN COMPUTERS NEEDED TO BE COMPLETELY OFF NOT IN STANDBY MODE. SHE SAID SHE HAD IT AS OFF AS IT WOULD GO. I RECOMMENDED SHE TAKE THE BATTERY OUT TO DISCONNECT THE PWR SOURCE. BEFORE TOUCHDOWN HER DEVICE (PHONE/PDA) WAS LIT UP WHITE AND GREEN LIGHTS AND SHE WAS ON IT. I MADE THE TAXI-IN PA AND THEN ADVISED PAX THAT THEIR CELL PHONES AND PAGERS COULD BE USED. SHE HAD BEEN ON HER PHONE WELL BEFORE BEING ADVISED SHE COULD. AS SOON AS THE SEAT BELT SIGN WAS TURNED OFF SHE RUSHED TO THE FRONT OF THE ACFT (WHERE I WAS) TO CONTINUE TELLING ME THAT I DIDN'T KNOW WHAT I WAS TALKING ABOUT. SHE WAS TRYING TO TELL ME ALL ABOUT HER DEVICE'S FUNCTIONS. I SAID I ONLY HAVE TO VERIFY IT'S OFF OR NOT XMITTING INFLT. SHE SAID I NEEDED TO TAKE THE BATTERY OUT OF MY WATCH BECAUSE IT WAS THE SAME THING. SHE THEN SAID I WAS CRABBY AND SHOVED HERSELF BY ME TO GET OFF THE ACFT.