This page contains information about which telephone companies the various 03004 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0300 400 | Allocated | Telephony Services Limited | 03/2007 |
| 0300 401 | Free | - | - |
| 0300 402 | Free | - | - |
| 0300 403 | Free | - | - |
| 0300 404 | Allocated | Nexbridge Communications Limited | 01/2012 |
| 0300 405 | Free | - | - |
| 0300 406 | Free | - | - |
| 0300 407 | Free | - | - |
| 0300 408 | Free | - | - |
| 0300 409 | Free | - | - |
| 0300 410 | Free | - | - |
| 0300 411 | Free | - | - |
| 0300 412 | Free | - | - |
| 0300 413 | Free | - | - |
| 0300 414 | Allocated | Nexus Telecommunications Limited | 02/2013 |
| 0300 415 | Free | - | - |
| 0300 416 | Free | - | - |
| 0300 417 | Free | - | - |
| 0300 418 | Free | - | - |
| 0300 419 | Free | - | - |
| 0300 420 | Free | - | - |
| 0300 421 | Allocated | Virgin Media Wholesale Limited | 05/2012 |
| 0300 422 | Allocated | Virgin Media Wholesale Limited | 05/2012 |
| 0300 423 | Allocated | Virgin Media Wholesale Limited | 05/2012 |
| 0300 424 | Free | - | - |
| 0300 425 | Free | - | - |
| 0300 426 | Free | - | - |
| 0300 427 | Free | - | - |
| 0300 428 | Free | - | - |
| 0300 429 | Free | - | - |
| 0300 430 | Free | - | - |
| 0300 431 | Free | - | - |
| 0300 432 | Free | - | - |
| 0300 433 | Free | - | - |
| 0300 434 | Free | - | - |
| 0300 435 | Allocated | IPV6 Limited | 01/2009 |
| 0300 436 | Free | - | - |
| 0300 437 | Free | - | - |
| 0300 438 | Free | - | - |
| 0300 439 | Free | - | - |
| 0300 440 | Free | - | - |
| 0300 441 | Free | - | - |
| 0300 442 | Free | - | - |
| 0300 443 | Free | - | - |
| 0300 444 | Allocated | Reality Network Services Limited | 03/2007 |
| 0300 445 | Free | - | - |
| 0300 446 | Free | - | - |
| 0300 447 | Free | - | - |
| 0300 448 | Free | - | - |
| 0300 449 | Free | - | - |
| 0300 450 | Free | - | - |
| 0300 451 | Free | - | - |
| 0300 452 | Free | - | - |
| 0300 453 | Free | - | - |
| 0300 454 | Free | - | - |
| 0300 455 | Allocated | TalkTalk Communications Limited | 05/2010 |
| 0300 456 | Allocated | TalkTalk Communications Limited | 03/2007 |
| 0300 457 | Free | - | - |
| 0300 458 | Allocated | TalkTalk Communications Limited | 05/2010 |
| 0300 459 | Free | - | - |
| 0300 460 | Free | - | - |
| 0300 461 | Free | - | - |
| 0300 462 | Free | - | - |
| 0300 463 | Free | - | - |
| 0300 464 | Free | - | - |
| 0300 465 | Free | - | - |
| 0300 466 | Allocated | Oxygen8 Communications UK Limited | 07/2009 |
| 0300 467 | Free | - | - |
| 0300 468 | Free | - | - |
| 0300 469 | Free | - | - |
| 0300 470 | Allocated | BT | 12/2013 |
| 0300 471 | Free | - | - |
| 0300 472 | Free | - | - |
| 0300 473 | Free | - | - |
| 0300 474 | Free | - | - |
| 0300 475 | Free | - | - |
| 0300 476 | Free | - | - |
| 0300 477 | Free | - | - |
| 0300 478 | Free | - | - |
| 0300 479 | Free | - | - |
| 0300 480 | Free | - | - |
| 0300 481 | Free | - | - |
| 0300 482 | Free | - | - |
| 0300 483 | Free | - | - |
| 0300 484 | Free | - | - |
| 0300 485 | Free | - | - |
| 0300 486 | Free | - | - |
| 0300 487 | Free | - | - |
| 0300 488 | Free | - | - |
| 0300 489 | Free | - | - |
| 0300 490 | Free | - | - |
| 0300 491 | Free | - | - |
| 0300 492 | Free | - | - |
| 0300 493 | Free | - | - |
| 0300 494 | Free | - | - |
| 0300 495 | Free | - | - |
| 0300 496 | Free | - | - |
| 0300 497 | Free | - | - |
| 0300 498 | Free | - | - |
| 0300 499 | Free | - | - |