We've just picked up a model of the same phone at a charity shop, and it's lost it's manual. I have found a pdf file of the manual of a 'similar' phone, and maybe the operation is the same. http://www.shop.bt.com/content/uni2/documentation/498l/025455.pdf
David [AKA 'Scratch', AKA 'Gizmo', AKA 'Hiawatha Loonbucket the third'], September 2008