This page contains information about which telephone companies the various 03456 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0345 600 | Allocated | BT | 04/2007 |
| 0345 601 | Allocated | BT | 04/2007 |
| 0345 602 | Allocated | BT | 04/2007 |
| 0345 603 | Allocated | BT | 04/2007 |
| 0345 604 | Allocated | BT | 04/2007 |
| 0345 605 | Allocated | BT | 04/2007 |
| 0345 606 | Allocated | BT | 04/2007 |
| 0345 607 | Allocated | BT | 04/2007 |
| 0345 608 | Allocated | BT | 04/2007 |
| 0345 609 | Allocated | BT | 04/2007 |
| 0345 610 | Allocated | BT | 04/2007 |
| 0345 611 | Allocated | BT | 04/2007 |
| 0345 612 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 613 | Protected | - | - |
| 0345 614 | Protected | - | - |
| 0345 615 | Allocated | Sesui Limited | 09/2014 |
| 0345 616 | Protected | - | - |
| 0345 617 | Protected | - | - |
| 0345 618 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 619 | Allocated | Core Telecom Limited | 02/2014 |
| 0345 620 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 621 | Allocated | Numbergroup Network Ltd | 11/2011 |
| 0345 622 | Protected | - | - |
| 0345 623 | Protected | - | - |
| 0345 624 | Protected | - | - |
| 0345 625 | Allocated | TTNC Limited | 04/2007 |
| 0345 626 | Allocated | Premier Voicemail Ltd | 10/2014 |
| 0345 627 | Protected | - | - |
| 0345 628 | Protected | - | - |
| 0345 629 | Allocated | Cheers International Sales Limited | 08/2014 |
| 0345 630 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 631 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 632 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 633 | Allocated | Cheers International Sales Limited | 06/2008 |
| 0345 634 | Allocated | Vodafone Ltd (Thus) | 06/2007 |
| 0345 635 | Protected | - | - |
| 0345 636 | Protected | - | - |
| 0345 637 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 638 | Allocated | Affiniti Integrated Solutions Ltd | 07/2013 |
| 0345 639 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 640 | Allocated | BT | 04/2007 |
| 0345 641 | Allocated | BT | 04/2007 |
| 0345 642 | Allocated | TTNC Limited | 04/2007 |
| 0345 643 | Allocated | Nexus Telecommunications Limited | 07/2007 |
| 0345 644 | Allocated | Nexus Telecommunications Limited | 07/2007 |
| 0345 645 | Protected | - | - |
| 0345 646 | Allocated | Gamma Telecom Holdings Ltd | 03/2014 |
| 0345 647 | Allocated | Number Solutions Ltd | 09/2007 |
| 0345 648 | Protected | - | - |
| 0345 649 | Protected | - | - |
| 0345 650 | Allocated | Virgin Media Limited | 10/2007 |
| 0345 651 | Protected | - | - |
| 0345 652 | Allocated | X-Pilot Limited | 09/2008 |
| 0345 653 | Allocated | Callagenix Ltd | 10/2010 |
| 0345 654 | Allocated | Voice Simplified Limited | 06/2014 |
| 0345 655 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 656 | Allocated | BT | 04/2007 |
| 0345 657 | Protected | - | - |
| 0345 658 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 659 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 660 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 661 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 662 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 663 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 664 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 665 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 666 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 667 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 668 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 669 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 670 | Protected | - | - |
| 0345 671 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0345 672 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0345 673 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0345 674 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0345 675 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0345 676 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0345 677 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0345 678 | Allocated | Vodafone Ltd (Energis) | 04/2007 |
| 0345 679 | Protected | - | - |
| 0345 680 | Allocated | Vodafone Ltd (C&W) | 04/2007 |
| 0345 681 | Protected | - | - |
| 0345 682 | Protected | - | - |
| 0345 683 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 684 | Protected | - | - |
| 0345 685 | Allocated | Six Degrees Unified Comms Limited | 07/2009 |
| 0345 686 | Allocated | Digital Mail Limited | 04/2008 |
| 0345 687 | Protected | - | - |
| 0345 688 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 689 | Allocated | Telecoms World Direct Ltd | 11/2008 |
| 0345 690 | Allocated | Six Degrees Unified Comms Limited | 07/2009 |
| 0345 691 | Protected | - | - |
| 0345 692 | Protected | - | - |
| 0345 693 | Allocated | TalkTalk Communications Limited | 07/2008 |
| 0345 694 | Protected | - | - |
| 0345 695 | Allocated | TalkTalk Communications Limited | 04/2014 |
| 0345 696 | Protected | - | - |
| 0345 697 | Protected | - | - |
| 0345 698 | Protected | - | - |
| 0345 699 | Protected | - | - |