SAMSUNG GALAXY S3 - SWAP FOR YOUR GALAXY S2 / IPHONE 4 + £140 ?

PLEASE READ THIS CAREFULLY.. I AM NOT SELLING MY PHONE FOR £140, I AM LOOKING TO DOWNGRADE TO A GALAXY S2 PLUS £150 CASH. GALAXY S3 OWNED FOR JUST OVER A MONTH, VERY GOOD CONDITION COMES LOCKED TO THE 3 NETWORK WITH BOX AND RECEIPT. PLEASE REMEMBER THIS IS ON THE 3 NETWORK - IT IS NOT UNLOCKED. CALL OR TXT ME ON 07447908981