Dialing code and originating UK Network:
0370 Vodafone
0374 Vodafone
0378 Vodafone
0385 Vodafone
0401 BT Cellnet
0402 BT Cellnet
0403 BT Cellnet
0410 BT Cellnet
0411 BT Cellnet
0421 Vodafone
0441 Vodafone
0467 Vodafone
0468 Vodafone
0498 Vodafone
0585 BT Cellnet
0589 BT Cellnet
07701 BT Cellnet
07702 BT Cellnet
07703 BT Cellnet
07710 BT Cellnet
07711 BT Cellnet
07712 BT Cellnet
07713 BT Cellnet
07714 BT Cellnet
07715 BT Cellnet
07718 BT Cellnet
07719 BT Cellnet
07720 BT Cellnet
07721 Vodafone
07729 BT Cellnet
07730 BT Cellnet
07731 BT Cellnet
07732 Vodafone
07733 Vodafone
07734 BT Cellnet
07736 BT Cellnet
07740 BT Cellnet
07741 Vodafone
077442 Dolphin*
077443 Dolphin*
077444 Dolphin*
077445 Dolphin*
077446 Dolphin*
077447 Dolphin*
077448 Dolphin*
077449 Dolphin*
07747 Vodafone
07748 Vodafone
07750 BT Cellnet
07751 BT Cellnet
07752 BT Cellnet
07753 BT Cellnet
07754 BT Cellnet
077552 Dolphin*
077553 Dolphin*
077554 Dolphin*
077555 Dolphin*
07759 BT Cellnet
07760 Vodafone
07761 BT Cellnet
07762 BT Cellnet
07763 BT Cellnet
07764 BT Cellnet
07765 Vodafone
07766 Vodafone
07767 Vodafone
07768 Vodafone
07769 Vodafone
07770 Vodafone
07771 Vodafone
07773 Orange
07774 Vodafone
07775 Vodafone
07776 Vodafone
07778 Vodafone
07779 Orange
07780 Vodafone
07785 Vodafone
07786 Vodafone
07787 Vodafone
07788 Vodafone
07789 Vodafone
07790 Orange
07791 Orange
07792 Orange
07796 Vodafone
07798 Vodafone
07799 Vodafone
07800 Orange
07801 BT Cellnet
07802 BT Cellnet
07803 BT Cellnet
07808 BT Cellnet
07809 BT Cellnet
07810 Vodafone
07811 Orange
07812 Orange
07813 Orange
07814 Orange
07815 Orange
07816 Orange
07817 Orange
07818 Vodafone
07831 Vodafone
07833 Vodafone
07836 Vodafone
07850 BT Cellnet
07855 Orange
07860 BT cellnet
07866 Orange
07867 Vodafone
07870 Orange
07876 Vodafone
07879 Vodafone
07880 Vodafone
07881 Vodafone
07884 Vodafone
07885 BT Cellnet
07887 Vodafone
07889 BT Cellnet
07890 Orange
07899 Vodafone
07900 Vodafone
07901 Vodafone
07903 One2One
07904 One2One
07905 One2One
07909 Vodafone
07919 Vodafone
07929 Orange
07930 One2One
07931 One2One
07932 One2One
07939 One2One
07940 One2One
07941 One2One
07944 One2One
07946 One2One
07947 One2One
07949 One2One
07950 One2One
07951 One2One
07952 One2One
07953 One2One
07956 One2One
07957 One2One
07958 One2One
07959 One2One
07960 One2One
07961 One2One
07962 One2One
07966 Orange
07967 Orange
07968 Orange
07970 Orange
07971 Orange
07973 Orange
07974 Orange
07976 Orange
07977 Orange
07979 Vodafone
07980 Orange
07984 One2One
07985 One2One
07986 One2One
07987 One2One
07989 Orange
07990 Vodafone
0802 BT Cellnet
0831 Vodafone
0836 Vodafone
0850 BT Cellnet
0860 BT Cellnet
0941 Orange
0956 One2One
0958 One2One
0961 One2One
0966 Orange
0973 Orange
0976 Orange
NOTE: Phone numbers can be ported cross network. To reliably determine the network from a phone number (MSISDN) you will need a HLR (Network lookup server) service such as that provided by IntelliSoftware