Is md198b iphone factory unlocked -

BRAND NEW BOX STILL SEALED APPLE IPHONE 4S BLACK 16GB
APPLE IPHONE 4S 16G BLACK open to any network Selling my Iphone 4s, BRAND NEW BOX is still SEALED This phone is an unwanted upgrade and I did not open the box as I intend to sell it will be a great bargain for yourself or as a gift!!!! guaranteed sealed!