Samsung Galaxy s3 sIII Sim-Free NEW Marble White ?

Hi there, I have just upgraded by phone to the newest Samsung Galaxy s3 in white as my son advised me its worth the most. Ill be honest i dont know much about the phone as just upgraded to sell it. Looking around it sells for about 350 and it is brand new just taken the front sticker off to check for any marks. Its in mint condition. Brand new phone is in my hand ready to swap for cash or post. Sorry for poor quality of photos. I do have a refund policy: within 7 days of receipt but item must be in same condition! Any questions, please ask. I will respond to questions in evening as i work during daytime. Thanks, Peter