Iphone Wifi Password – Help… (please!) !!?

Does anyone know how to find out what your password is in order to connect the wifi on an iphone to a network? I've just brought an iphone and im trying to set the wifi up to my computer using sky and a netgear router (issued by Sky). The phone finds the network name but asks for a password (sure it should be the network key?) but I have tried entering the network key and it will not connect saying the password is incorrect... Does anyone know how to find the so called "password" for your network?? Thanks!