apple iphone 4s black 16g o2 : Beckenham : £380

hi here i have a brand new iphone 4s for sale, I was due for an upgrade but I still had the iphone4 and wasn't really bother about the new one. I am on a o2 contract and believe the phone should be locked on o2.
the phone is brand new , it still has the seal on the face but the box was open at the shop so the assistant could show me the phone.
I can post for a fee only in the UK so people who call me asking me to post world wide please dont waste your time and MINE!!!
thanks for looking!
. apple iphone 4s black 16g o2 : Beckenham : £380