I phone model mc637za ?

APPLE IPHONE 3G-UNLOCKED GOOD CONDITION SELL OR MAY SWAP
APPLE IPHONE 3G-UNLOCKED GOOD CONDITION. NO MARKS ON SCREEN. USUAL MARKS ON BACK COVER AS PER NORMAL USE.COMES WITH CHARGER USB CABLE ETC SELL OR MAY SWAP FOR GOOD BIG SCREEN LAPTOP. PREFER LOCAL SWAP OR CASH COLLECTION ONLY