This page contains information about which telephone companies the various 03306 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0330 600 | Allocated | Group 3 Technology Limited | 04/2011 |
| 0330 601 | Free | - | - |
| 0330 602 | Free | - | - |
| 0330 603 | Free | - | - |
| 0330 604 | Free | - | - |
| 0330 605 | Free | - | - |
| 0330 606 | Allocated | Citrus Telecommunications Ltd | 12/2011 |
| 0330 607 | Free | - | - |
| 0330 608 | Free | - | - |
| 0330 609 | Free | - | - |
| 0330 610 | Free | - | - |
| 0330 611 | Allocated | Proton Telecom Limited | 08/2008 |
| 0330 612 | Free | - | - |
| 0330 613 | Free | - | - |
| 0330 614 | Free | - | - |
| 0330 615 | Free | - | - |
| 0330 616 | Free | - | - |
| 0330 617 | Free | - | - |
| 0330 618 | Free | - | - |
| 0330 619 | Free | - | - |
| 0330 620 | Free | - | - |
| 0330 621 | Free | - | - |
| 0330 622 | Free | - | - |
| 0330 623 | Free | - | - |
| 0330 624 | Free | - | - |
| 0330 625 | Free | - | - |
| 0330 626 | Free | - | - |
| 0330 627 | Free | - | - |
| 0330 628 | Free | - | - |
| 0330 629 | Free | - | - |
| 0330 630 | Free | - | - |
| 0330 631 | Free | - | - |
| 0330 632 | Free | - | - |
| 0330 633 | Allocated | Telecoms World Direct Ltd | 06/2014 |
| 0330 634 | Free | - | - |
| 0330 635 | Allocated | Alphatalk Ltd | 04/2011 |
| 0330 636 | Free | - | - |
| 0330 637 | Free | - | - |
| 0330 638 | Free | - | - |
| 0330 639 | Free | - | - |
| 0330 640 | Free | - | - |
| 0330 641 | Free | - | - |
| 0330 642 | Free | - | - |
| 0330 643 | Free | - | - |
| 0330 644 | Free | - | - |
| 0330 645 | Free | - | - |
| 0330 646 | Free | - | - |
| 0330 647 | Free | - | - |
| 0330 648 | Free | - | - |
| 0330 649 | Free | - | - |
| 0330 650 | Free | - | - |
| 0330 651 | Free | - | - |
| 0330 652 | Free | - | - |
| 0330 653 | Free | - | - |
| 0330 654 | Allocated | BT | 11/2014 |
| 0330 655 | Free | - | - |
| 0330 656 | Free | - | - |
| 0330 657 | Free | - | - |
| 0330 658 | Free | - | - |
| 0330 659 | Free | - | - |
| 0330 660 | Allocated | Nexus Telecommunications Limited | 12/2008 |
| 0330 661 | Free | - | - |
| 0330 662 | Free | - | - |
| 0330 663 | Free | - | - |
| 0330 664 | Free | - | - |
| 0330 665 | Free | - | - |
| 0330 666 | Allocated | Tuxtel Ltd | 11/2009 |
| 0330 667 | Free | - | - |
| 0330 668 | Free | - | - |
| 0330 669 | Free | - | - |
| 0330 670 | Allocated | BT | 09/2013 |
| 0330 671 | Free | - | - |
| 0330 672 | Free | - | - |
| 0330 673 | Free | - | - |
| 0330 674 | Free | - | - |
| 0330 675 | Free | - | - |
| 0330 676 | Free | - | - |
| 0330 677 | Free | - | - |
| 0330 678 | Free | - | - |
| 0330 679 | Free | - | - |
| 0330 680 | Free | - | - |
| 0330 681 | Free | - | - |
| 0330 682 | Free | - | - |
| 0330 683 | Free | - | - |
| 0330 684 | Allocated | OVH Limited | 06/2008 |
| 0330 685 | Free | - | - |
| 0330 686 | Allocated | UK Broadband Limited | 12/2013 |
| 0330 687 | Free | - | - |
| 0330 688 | Free | - | - |
| 0330 689 | Free | - | - |
| 0330 690 | Free | - | - |
| 0330 691 | Free | - | - |
| 0330 692 | Free | - | - |
| 0330 693 | Free | - | - |
| 0330 694 | Free | - | - |
| 0330 695 | Free | - | - |
| 0330 696 | Free | - | - |
| 0330 697 | Free | - | - |
| 0330 698 | Free | - | - |
| 0330 699 | Free | - | - |