iphone 4 16gb unlocked boxed etc.... *

iphone 4 16gb original box charger synx cable manual/booklets was using 02/giffgaff but is unlocked as have used a 3sim with no problems.... i upgraded through itunes to new operating system..... now it just says searching and wont let me activate.. i go tho all the settings and says takes up 2 3mins to activate and it just spins... havent got a clue... could be something stupied im doing and easy to sort out.... phone has bin in a case so no scratches on back or front.... grab a bargain... will remove ad once sold... ring or text anytime...