NEW BOXED SAMSUNG GALAXY S2 open to all networks ?

For sale Samsung Galaxy S2 16GB black unlocked, phone is in good as new condition and comes with the original box and all the accessories, also cover for the phone, £280 ono. the phone has 16GB on board storage, 8mp camera, and was voted the best smartphone of last year, I have loved this phone and am only selling i upgraded to the Galaxy S3. THE ONLY PAYMENT WE WILL ACCEPT IS CASH IN PERSON