when i moved house i took my surfboard 4100 with me the engineer arrived and wanted to take my surfboard away and install one of the new ones now issued ,i refused to let him do that and insisted he hooked up my surfboard he refused and said it wont work in your area mate you best contact the cs so i phoned ntl myself spoke to a chap in cs/tec who said yes of course your surfboard will work wots your mac add so i gave it to him and bingo back on line within 1/2 hour of the engineer leaveing my house now i know why he wanted to take my modem away and i think the little house knows something about it to