i have got this phone up for sale as i do not use it as dont like the sony ericsson. it will work on o2 and i have try a orange sim card and it work with it so thinking it is unlock. is in the box with all is stuff. here is a bit on the phone now The Sony Ericsson K800i boasts a 3.2 Mega-pixel camera, and unlike most camera phones, has a built-in Xenon flash usually found on digital cameras. With auto-focus, your photos will be sharper and best picture takes a sequence of photos from just one click and you can then select the best one to keep. Other features include red eye removal and adding clip art and effects to your pictures as well as the ever-amusing 'Face Warp'.