Just to add, this dongle is brand new and works well.
The person selling it has moved, unfortunately to a black spot in the 3 network coverage area. This black spot is in Wallasey along seanbank road towards montpellier crescent.
The dongle works very well outside this area. As with all good advice, check your post code on the 3 website for signal strength in your area.
http://www.three.co.uk/Help_Support/Coverage