iphone 3gs in black 16gb ( not iphone 4) ?

hi there, i have an iphone 3gs 16 gb in black th fone is 100% condition no faults on it at all ! ! ! just had a new screen put in it for 30 screen protector on the screen the fone is excelent in every way possible im am selling because i have finaly got an upgrade to an iphone 4s the fone is blocked which mean there is no service in this country. i am located in west london and am willing to meet up with the buyer please call me if u have any other questions 07927820173