As part of the Carphone Warehouse “Smart Deal”, the Noka Lumia 800 Windows Phone is available for free on contract for the next seven days starting today July 6th, 2012 and ending on Friday, July 13th, 2012.
Considering this deal involves purchasing (ultimately for free) the Lumia 800 on contract, the supported networks are O2, Orange, T-Mobile, Vodafone, and 3. As mentioned on the product page, plans start from £15.50 per month. This deal only applies to the black Lumia 800 Windows Phone.
Visit the Carphone Warehouse Lumia 800 product page for more information and to place your order.