TELEPHONE AND SUPERFAST BROADBAND - These cables are perfect for extending both Telephone and Broadband signals around the home. They are compatible with BT Infinity, Sky, EE, Plusnet, Virgin Telephone, TalkTalk and many other Internet Service Providers BEWARE OF CHEAP IMPORTED VERSIONS - There is currently a surplus of imitation copper cables on the UK market. Many copies of BT CW1308 cables claim to be manufactured to BT spec but instead use either Copper Clad Steel (CCS) or Copper Clad Aluminium (CCA) AVOID SLOW BROADBAND + A QUIET PHONE - Using the incorrect cable can have a dramatic effect on Router speeds and even the volume on your Telephone line.