Hi, Took my daughter out to the park last week and lost my Iphone 4 bought from an o2 shop a few months ago. Gutted. Insurance came though (not gutted) and have just received my new freshly sealed, unopened iPhone 4 from the insurance company. Is there a way to check if it is an unlocked phone before putting my replacement o2 micro sim in? Also, when I put my sim in, will it then lock to o2? Its charging at the mo, so gonna try in a bit. Any advice is appreciated.