Samsung Galaxy S3, 16GB sim free Marble White *

HERE IS A BRAND NEW SAMSUNG GALAXY S3 16GB WHITE SIMFREE 1 DAY OLD!!! THIS PHONE HAS ONLY BEEN SWITCHED ON ONCE TO TEST WORKING AND COMES WITH BOX AND ALL THE ACCESSORY.I CHECKED 3 SIM CARDs (O2) AND (T Mobile) IS WORKING BUT THREE (3) IS not WORKING. ANY QUESTION PLZ ASK