This page contains information about which telephone companies the various 03309 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0330 900 | Allocated | Windsor Telecom Plc | 11/2010 |
| 0330 901 | Free | - | - |
| 0330 902 | Free | - | - |
| 0330 903 | Free | - | - |
| 0330 904 | Free | - | - |
| 0330 905 | Free | - | - |
| 0330 906 | Free | - | - |
| 0330 907 | Free | - | - |
| 0330 908 | Free | - | - |
| 0330 909 | Free | - | - |
| 0330 910 | Free | - | - |
| 0330 911 | Free | - | - |
| 0330 912 | Free | - | - |
| 0330 913 | Free | - | - |
| 0330 914 | Free | - | - |
| 0330 915 | Free | - | - |
| 0330 916 | Free | - | - |
| 0330 917 | Free | - | - |
| 0330 918 | Free | - | - |
| 0330 919 | Free | - | - |
| 0330 920 | Free | - | - |
| 0330 921 | Free | - | - |
| 0330 922 | Free | - | - |
| 0330 923 | Free | - | - |
| 0330 924 | Free | - | - |
| 0330 925 | Free | - | - |
| 0330 926 | Free | - | - |
| 0330 927 | Free | - | - |
| 0330 928 | Free | - | - |
| 0330 929 | Free | - | - |
| 0330 930 | Free | - | - |
| 0330 931 | Free | - | - |
| 0330 932 | Free | - | - |
| 0330 933 | Free | - | - |
| 0330 934 | Free | - | - |
| 0330 935 | Free | - | - |
| 0330 936 | Free | - | - |
| 0330 937 | Free | - | - |
| 0330 938 | Free | - | - |
| 0330 939 | Free | - | - |
| 0330 940 | Free | - | - |
| 0330 941 | Free | - | - |
| 0330 942 | Free | - | - |
| 0330 943 | Free | - | - |
| 0330 944 | Free | - | - |
| 0330 945 | Free | - | - |
| 0330 946 | Free | - | - |
| 0330 947 | Free | - | - |
| 0330 948 | Free | - | - |
| 0330 949 | Free | - | - |
| 0330 950 | Free | - | - |
| 0330 951 | Free | - | - |
| 0330 952 | Free | - | - |
| 0330 953 | Free | - | - |
| 0330 954 | Free | - | - |
| 0330 955 | Free | - | - |
| 0330 956 | Free | - | - |
| 0330 957 | Free | - | - |
| 0330 958 | Free | - | - |
| 0330 959 | Free | - | - |
| 0330 960 | Free | - | - |
| 0330 961 | Free | - | - |
| 0330 962 | Free | - | - |
| 0330 963 | Free | - | - |
| 0330 964 | Free | - | - |
| 0330 965 | Free | - | - |
| 0330 966 | Free | - | - |
| 0330 967 | Free | - | - |
| 0330 968 | Free | - | - |
| 0330 969 | Free | - | - |
| 0330 970 | Free | - | - |
| 0330 971 | Free | - | - |
| 0330 972 | Free | - | - |
| 0330 973 | Free | - | - |
| 0330 974 | Free | - | - |
| 0330 975 | Free | - | - |
| 0330 976 | Free | - | - |
| 0330 977 | Allocated | Twelve Telecom Limited | 04/2013 |
| 0330 978 | Free | - | - |
| 0330 979 | Free | - | - |
| 0330 980 | Free | - | - |
| 0330 981 | Free | - | - |
| 0330 982 | Free | - | - |
| 0330 983 | Free | - | - |
| 0330 984 | Free | - | - |
| 0330 985 | Free | - | - |
| 0330 986 | Free | - | - |
| 0330 987 | Free | - | - |
| 0330 988 | Free | - | - |
| 0330 989 | Free | - | - |
| 0330 990 | Allocated | TelecomIQ Limited | 09/2013 |
| 0330 991 | Free | - | - |
| 0330 992 | Free | - | - |
| 0330 993 | Allocated | Nowtel Wholesale Limited | 02/2013 |
| 0330 994 | Free | - | - |
| 0330 995 | Allocated | Metronet (UK) Limited | 10/2014 |
| 0330 996 | Free | - | - |
| 0330 997 | Free | - | - |
| 0330 998 | Allocated | Citrus Telecommunications Ltd | 11/2013 |
| 0330 999 | Allocated | Number Solutions Ltd | 04/2007 |