This page contains information about which telephone companies the various 03305 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0330 500 | Allocated | Served Up Limited. | 10/2008 |
| 0330 501 | Free | - | - |
| 0330 502 | Free | - | - |
| 0330 503 | Free | - | - |
| 0330 504 | Free | - | - |
| 0330 505 | Allocated | Square Systems Limited | 11/2008 |
| 0330 506 | Free | - | - |
| 0330 507 | Free | - | - |
| 0330 508 | Free | - | - |
| 0330 509 | Free | - | - |
| 0330 510 | Free | - | - |
| 0330 511 | Free | - | - |
| 0330 512 | Free | - | - |
| 0330 513 | Free | - | - |
| 0330 514 | Free | - | - |
| 0330 515 | Free | - | - |
| 0330 516 | Free | - | - |
| 0330 517 | Free | - | - |
| 0330 518 | Free | - | - |
| 0330 519 | Free | - | - |
| 0330 520 | Free | - | - |
| 0330 521 | Free | - | - |
| 0330 522 | Free | - | - |
| 0330 523 | Free | - | - |
| 0330 524 | Free | - | - |
| 0330 525 | Free | - | - |
| 0330 526 | Free | - | - |
| 0330 527 | Free | - | - |
| 0330 528 | Free | - | - |
| 0330 529 | Free | - | - |
| 0330 530 | Free | - | - |
| 0330 531 | Free | - | - |
| 0330 532 | Free | - | - |
| 0330 533 | Free | - | - |
| 0330 534 | Free | - | - |
| 0330 535 | Free | - | - |
| 0330 536 | Free | - | - |
| 0330 537 | Free | - | - |
| 0330 538 | Free | - | - |
| 0330 539 | Free | - | - |
| 0330 540 | Free | - | - |
| 0330 541 | Free | - | - |
| 0330 542 | Free | - | - |
| 0330 543 | Free | - | - |
| 0330 544 | Free | - | - |
| 0330 545 | Free | - | - |
| 0330 546 | Free | - | - |
| 0330 547 | Free | - | - |
| 0330 548 | Free | - | - |
| 0330 549 | Free | - | - |
| 0330 550 | Allocated | Atomstream Limited | 04/2010 |
| 0330 551 | Free | - | - |
| 0330 552 | Free | - | - |
| 0330 553 | Free | - | - |
| 0330 554 | Free | - | - |
| 0330 555 | Allocated | Windsor Telecom Plc | 07/2007 |
| 0330 556 | Free | - | - |
| 0330 557 | Free | - | - |
| 0330 558 | Free | - | - |
| 0330 559 | Free | - | - |
| 0330 560 | Free | - | - |
| 0330 561 | Free | - | - |
| 0330 562 | Free | - | - |
| 0330 563 | Free | - | - |
| 0330 564 | Free | - | - |
| 0330 565 | Free | - | - |
| 0330 566 | Free | - | - |
| 0330 567 | Free | - | - |
| 0330 568 | Free | - | - |
| 0330 569 | Free | - | - |
| 0330 570 | Free | - | - |
| 0330 571 | Free | - | - |
| 0330 572 | Free | - | - |
| 0330 573 | Free | - | - |
| 0330 574 | Free | - | - |
| 0330 575 | Free | - | - |
| 0330 576 | Free | - | - |
| 0330 577 | Free | - | - |
| 0330 578 | Free | - | - |
| 0330 579 | Free | - | - |
| 0330 580 | Free | - | - |
| 0330 581 | Free | - | - |
| 0330 582 | Free | - | - |
| 0330 583 | Free | - | - |
| 0330 584 | Free | - | - |
| 0330 585 | Free | - | - |
| 0330 586 | Free | - | - |
| 0330 587 | Allocated | Orange Business Holdings UK Limited | 01/2012 |
| 0330 588 | Free | - | - |
| 0330 589 | Free | - | - |
| 0330 590 | Free | - | - |
| 0330 591 | Free | - | - |
| 0330 592 | Free | - | - |
| 0330 593 | Free | - | - |
| 0330 594 | Free | - | - |
| 0330 595 | Free | - | - |
| 0330 596 | Free | - | - |
| 0330 597 | Free | - | - |
| 0330 598 | Free | - | - |
| 0330 599 | Free | - | - |