This page contains information about which telephone companies the various 03303 numbers are allocated to.
| First Digits | Status | Communications Provider | Change |
|---|---|---|---|
| 0330 300 | Allocated | Premium O Limited | 03/2007 |
| 0330 301 | Free | - | - |
| 0330 302 | Free | - | - |
| 0330 303 | Allocated | Virgin Media Wholesale Limited | 10/2009 |
| 0330 304 | Free | - | - |
| 0330 305 | Free | - | - |
| 0330 306 | Free | - | - |
| 0330 307 | Free | - | - |
| 0330 308 | Free | - | - |
| 0330 309 | Free | - | - |
| 0330 310 | Allocated | Vodafone Ltd (C&W) | 12/2009 |
| 0330 311 | Free | - | - |
| 0330 312 | Free | - | - |
| 0330 313 | Allocated | Outsourcery Hosting Ltd | 05/2009 |
| 0330 314 | Free | - | - |
| 0330 315 | Free | - | - |
| 0330 316 | Free | - | - |
| 0330 317 | Free | - | - |
| 0330 318 | Free | - | - |
| 0330 319 | Free | - | - |
| 0330 320 | Allocated | Ziron (UK) Ltd | 10/2008 |
| 0330 321 | Allocated | FleXtel Limited | 03/2007 |
| 0330 322 | Free | - | - |
| 0330 323 | Allocated | Need More Time Ltd | 07/2007 |
| 0330 324 | Free | - | - |
| 0330 325 | Free | - | - |
| 0330 326 | Free | - | - |
| 0330 327 | Free | - | - |
| 0330 328 | Allocated | Advanced Voip Solutions Ltd | 07/2013 |
| 0330 329 | Free | - | - |
| 0330 330 | Allocated | Vodafone Ltd (C&W) | 03/2007 |
| 0330 331 | Allocated | Syntec Limited | 03/2009 |
| 0330 332 | Allocated | Vodafone Ltd (Thus) | 11/2008 |
| 0330 333 | Allocated | Affiniti Integrated Solutions Ltd | 03/2007 |
| 0330 334 | Allocated | Vodafone Ltd (C&W) | 01/2011 |
| 0330 335 | Allocated | Synety Limited | 06/2011 |
| 0330 336 | Allocated | Via-Vox Limited | 12/2009 |
| 0330 337 | Allocated | Teledesign Solutions Limited | 07/2012 |
| 0330 338 | Allocated | Tesla Dynamic Ltd | 06/2011 |
| 0330 339 | Allocated | Smashbox Marketing Ltd | 09/2013 |
| 0330 340 | Allocated | TelXL Ltd | 07/2009 |
| 0330 341 | Free | - | - |
| 0330 342 | Free | - | - |
| 0330 343 | Allocated | Virgin Media Wholesale Limited | 02/2014 |
| 0330 344 | Allocated | Voicetec Systems Ltd | 09/2011 |
| 0330 345 | Allocated | TG Support Limited | 05/2007 |
| 0330 346 | Free | - | - |
| 0330 347 | Free | - | - |
| 0330 348 | Free | - | - |
| 0330 349 | Free | - | - |
| 0330 350 | Allocated | Aloha Telecommunications Limited | 08/2011 |
| 0330 351 | Free | - | - |
| 0330 352 | Free | - | - |
| 0330 353 | Allocated | Inclarity Communications Ltd | 01/2013 |
| 0330 354 | Allocated | We Love Communications Limited | 08/2012 |
| 0330 355 | Allocated | Phone Co-Op Numbering Limited | 11/2010 |
| 0330 356 | Free | - | - |
| 0330 357 | Free | - | - |
| 0330 358 | Free | - | - |
| 0330 359 | Free | - | - |
| 0330 360 | Allocated | Aloha Telecommunications Limited | 08/2012 |
| 0330 361 | Free | - | - |
| 0330 362 | Free | - | - |
| 0330 363 | Allocated | Spitfire Network Services Ltd | 01/2009 |
| 0330 364 | Free | - | - |
| 0330 365 | Allocated | Tripudio Limited | 01/2014 |
| 0330 366 | Allocated | Moonshado Inc | 06/2009 |
| 0330 367 | Free | - | - |
| 0330 368 | Free | - | - |
| 0330 369 | Free | - | - |
| 0330 370 | Allocated | Zestel Limited | 02/2013 |
| 0330 371 | Free | - | - |
| 0330 372 | Allocated | Orange | 06/2008 |
| 0330 373 | Allocated | Orange | 06/2008 |
| 0330 374 | Allocated | Orange | 06/2008 |
| 0330 375 | Allocated | Orange | 06/2008 |
| 0330 376 | Allocated | Orange | 06/2008 |
| 0330 377 | Allocated | 24 Seven Communications Ltd | 06/2009 |
| 0330 378 | Allocated | Digitech Solutions Global Limited | 05/2011 |
| 0330 379 | Free | - | - |
| 0330 380 | Allocated | Telappliant Ltd | 03/2014 |
| 0330 381 | Free | - | - |
| 0330 382 | Free | - | - |
| 0330 383 | Free | - | - |
| 0330 384 | Free | - | - |
| 0330 385 | Free | - | - |
| 0330 386 | Free | - | - |
| 0330 387 | Free | - | - |
| 0330 388 | Protected | - | - |
| 0330 389 | Free | - | - |
| 0330 390 | Free | - | - |
| 0330 391 | Free | - | - |
| 0330 392 | Free | - | - |
| 0330 393 | Free | - | - |
| 0330 394 | Free | - | - |
| 0330 395 | Free | - | - |
| 0330 396 | Free | - | - |
| 0330 397 | Free | - | - |
| 0330 398 | Allocated | Square Systems Limited | 06/2014 |
| 0330 399 | Free | - | - |