UK area code
01205 area code — Boston
01205 is Ofcom’s Boston numbering area, in Lincolnshire, East Midlands England. 97 phone companies hold its 136 allocated number blocks. Its numbers are written like 01205 234 567. The nearest other codes are 01406 Holbeach (19 km) and 01775 Spalding (23 km).
01205 at a glance
- Ofcom area name
- Boston
- County
- Lincolnshire
- Council area
- Lincolnshire
- Region
- East Midlands England
- Number format
- 01205 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0205)
- Allocated blocks
- 136 of 406 (33%) across 97 providers
- Newest block
- 26 January 2026 (1 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01205 number called you
No clear pattern in reports for these numbers yet. If a call worried you:
- 1
Call back on a number you trust
If a caller says they're your bank, HMRC, a courier or a council, hang up and ring the organisation on the number from its website or your statement, never the number that called you. Caller ID can be faked.
- 2
Forward it to 7726
On a mobile, copy the caller's number from your recent calls and text it to 7726 (it spells SPAM). Scam texts can be forwarded to 7726 as they are. It's free, and your network uses the reports to investigate and block numbers.
- 3
Stop sales calls
Register your landline and mobile free with the Telephone Preference Service (0345 070 0707). Legitimate UK marketers must check it; calls should drop within 28 days. It won't stop scammers.
- 4
If you lost money or shared details
Call your bank on the number on your card (or 159 to reach most UK banks safely), then report it to Report Fraud online or on 0300 123 2040. Report Fraud replaced Action Fraud on 4 December 2025 for England, Wales and Northern Ireland; in Scotland call Police Scotland on 101.
01205 history and number format
Number format: Numbers on 01205 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01205 234 567.
Before 1995: 01205 took its current form at PhONEday on 16 April 1995, when a "1" was inserted into every UK geographic code — before that the area dialled 0205.
Local dialling: Traditionally not from another 01205 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01205 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01205 was allocated on 15 July 1994, and the most recent on 26 January 2026. 1 block was allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01205 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01205 numbers
Every Ofcom range holder with blocks on 01205, by allocated blocks. The holder is the company Ofcom allocated the block to; a number can since have been ported to another provider (see range holder vs current provider).
| Range holder | Allocated | All blocks | First block | Latest block |
|---|---|---|---|---|
| BT | 19 | 19 | 15 July 1994 | 6 October 2022 |
| Sky UK Limited | 6 | 6 | 20 June 2013 | 14 December 2022 |
| TalkTalk Communications Limited | 6 | 6 | 17 January 2012 | 10 February 2015 |
| GCI Network Solutions Limited | 4 | 4 | 19 April 2017 | 20 December 2023 |
| Digital Space Group Limited | 3 | 3 | 29 November 2007 | 12 April 2016 |
| Gamma Telecom Holdings Limited | 3 | 3 | 8 March 2005 | 30 January 2025 |
| Colt Technology Services | 2 | 2 | 27 September 2012 | 23 February 2018 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| Telecom2 Limited | 2 | 2 | 11 September 2009 | 11 September 2009 |
| Vodafone Ltd (C&W) | 2 | 2 | 30 July 2013 | 1 April 2019 |
| (AQ) LIMITED | 1 | 1 | 10 September 2012 | 10 September 2012 |
| 8x8 Communications UK Limited | 1 | 1 | 26 March 2012 | 26 March 2012 |
| AQL Wholesale Ltd | 1 | 1 | 21 June 2006 | 21 June 2006 |
| Adepteo Limited | 1 | 1 | 16 January 2017 | 16 January 2017 |
| Alnitak GmbH | 1 | 1 | 3 March 2017 | 3 March 2017 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 24 February 2009 | 24 February 2009 |
| Atomstream Limited | 1 | 1 | 25 February 2010 | 25 February 2010 |
| Barritel Limited | 1 | 1 | 16 February 2006 | 16 February 2006 |
| Belgacom International Carrier Services SA | 1 | 1 | 3 October 2019 | 3 October 2019 |
| Bicom Systems EURL | 1 | 1 | 2 March 2012 | 2 March 2012 |
| Bink Networks Ltd | 1 | 1 | 27 March 2023 | 27 March 2023 |
| Business Broadcast Communications Limited | 1 | 1 | 16 October 2009 | 16 October 2009 |
| CFL Communications Ltd | 1 | 1 | 7 July 2009 | 7 July 2009 |
| Calltracks Limited | 1 | 1 | 19 September 2013 | 19 September 2013 |
| Citrus Telecommunications Ltd | 1 | 1 | 6 March 2006 | 6 March 2006 |
| Commi Holdings Limited | 1 | 1 | 21 November 2016 | 21 November 2016 |
| Content Guru Limited | 1 | 1 | 12 October 2012 | 12 October 2012 |
| DIDWW Ireland Limited | 1 | 1 | 18 February 2021 | 18 February 2021 |
| DRD Communications Limited | 1 | 1 | 5 October 2023 | 5 October 2023 |
| Datazero Ltd | 1 | 1 | 2 November 2010 | 2 November 2010 |
Showing the 30 largest of 97 holders.
All number blocks on 01205first 200 of 406, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 120500 | Protected | — |
| +44 120501 | Protected | — |
| +44 120502 | Protected | — |
| +44 120503 | Protected | — |
| +44 120504 | Protected | — |
| +44 120505 | Protected | — |
| +44 120506 | Protected | — |
| +44 120507 | Protected | — |
| +44 120508 | Protected | — |
| +44 120509 | Protected | — |
| +44 120510 | Protected | — |
| +44 120511 | Protected | — |
| +44 120512 | Protected | — |
| +44 120513 | Protected | — |
| +44 120514 | Protected | — |
| +44 120515 | Protected | — |
| +44 120516 | Protected | — |
| +44 120517 | Protected | — |
| +44 120518 | Protected | — |
| +44 120519 | Protected | — |
| +44 120520 | Allocated | AQL Wholesale Ltd |
| +44 1205210 | Allocated | Linear Telecoms Limited |
| +44 1205211 | Allocated | Minotaur Telecom Limited |
| +44 1205212 | Allocated | Simwood eSMS Limited |
| +44 1205213 | Allocated | 8x8 Communications UK Limited |
| +44 1205214 | Allocated | ICC Networks Ltd |
| +44 1205215 | Protected | — |
| +44 1205216 | Allocated | IOVOX Limited |
| +44 1205217 | Allocated | Hello Telecom (UK) Limited |
| +44 1205218 | Allocated | Bicom Systems EURL |
| +44 1205219 | Allocated | Ziron Limited |
| +44 120522 | Allocated | GCI Network Solutions Limited |
| +44 1205230 | Free | — |
| +44 1205231 | Free | — |
| +44 1205232 | Free | — |
| +44 1205233 | Free | — |
| +44 1205234 | Free | — |
| +44 1205235 | Free | — |
| +44 1205236 | Free | — |
| +44 1205237 | Free | — |
| +44 1205238 | Free | — |
| +44 1205239 | Free | — |
| +44 120524 | Protected | — |
| +44 120525 | Allocated | IV Response Limited |
| +44 120526 | Allocated | BT |
| +44 120527 | Allocated | BT |
| +44 120528 | Allocated | BT |
| +44 120529 | Allocated | BT |
| +44 120530 | Allocated | Flextel Limited |
| +44 120531 | Allocated | BT |
| +44 1205320 | Allocated | DRD Communications Limited |
| +44 1205321 | Protected | — |
| +44 1205322 | Protected | — |
| +44 1205323 | Allocated | Nexbridge Communications Limited |
| +44 1205324 | Allocated | Orbtalk Limited |
| +44 1205325 | Protected | — |
| +44 1205326 | Protected | — |
| +44 1205327 | Allocated | TalkTalk Communications Limited |
| +44 1205328 | Protected | — |
| +44 1205329 | Allocated | Internexus Networks Limited |
| +44 120533 | Allocated | Gamma Telecom Holdings Limited |
| +44 1205340 | Allocated | Windsor Telecom Limited |
| +44 1205341 | Allocated | Telephone Box Limited |
| +44 1205342 | Protected | — |
| +44 1205343 | Allocated | Phone Co-Op Numbering Limited |
| +44 1205344 | Protected | — |
| +44 1205345 | Allocated | VoiceHost Limited |
| +44 1205346 | Allocated | Invosys Limited |
| +44 1205347 | Allocated | Invoco Ltd |
| +44 1205348 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1205349 | Allocated | Digital Mail Limited |
| +44 120535 | Allocated | BT |
| +44 120536 | Allocated | BT |
| +44 120537 | Allocated | TGL Services (UK) Ltd |
| +44 1205380 | Protected | — |
| +44 1205381 | Allocated | EVE CONNECT LTD |
| +44 1205382 | Allocated | Adepteo Limited |
| +44 1205383 | Allocated | I.T Communications Limited |
| +44 1205384 | Allocated | Sky UK Limited |
| +44 1205385 | Allocated | Fuse 2 Communications Ltd |
| +44 1205386 | Allocated | IP Voice Networks Ltd |
| +44 1205387 | Allocated | Number Services Ltd. |
| +44 1205388 | Allocated | Alnitak GmbH |
| +44 1205389 | Allocated | Entanet International Ltd |
| +44 1205390 | Protected | — |
| +44 1205391 | Protected | — |
| +44 1205392 | Protected | — |
| +44 1205393 | Allocated | Digital Space Group Limited |
| +44 1205394 | Protected | — |
| +44 1205395 | Protected | — |
| +44 1205396 | Protected | — |
| +44 1205397 | Protected | — |
| +44 1205398 | Protected | — |
| +44 1205399 | Protected | — |
| +44 120540 | Allocated | TTNC Limited |
| +44 120541 | Protected | — |
| +44 120542 | Allocated | Citrus Telecommunications Ltd |
| +44 1205430 | Protected | — |
| +44 1205431 | Protected | — |
| +44 1205432 | Protected | — |
| +44 1205433 | Protected | — |
| +44 1205434 | Protected | — |
| +44 1205435 | Protected | — |
| +44 1205436 | Protected | — |
| +44 1205437 | Protected | — |
| +44 1205438 | Protected | — |
| +44 1205439 | Protected | — |
| +44 120544 | Allocated | Vodafone Ltd (C&W) |
| +44 120545 | Allocated | Vodafone Ltd (C&W) |
| +44 120546 | Allocated | BT |
| +44 1205470 | Protected | — |
| +44 1205471 | Protected | — |
| +44 1205472 | Protected | — |
| +44 1205473 | Protected | — |
| +44 1205474 | Protected | — |
| +44 1205475 | Protected | — |
| +44 1205476 | Protected | — |
| +44 1205477 | Allocated | Spitfire Network Services Limited |
| +44 1205478 | Protected | — |
| +44 1205479 | Protected | — |
| +44 120548 | Allocated | BT |
| +44 120549 | Protected | — |
| +44 120550 | Allocated | Net-Work Internet Ltd |
| +44 120551 | Allocated | VoIP-Un Limited |
| +44 120552 | Allocated | Digital Space Group Limited |
| +44 1205530 | Protected | — |
| +44 1205531 | Protected | — |
| +44 1205532 | Protected | — |
| +44 1205533 | Allocated | GCI Network Solutions Limited |
| +44 1205534 | Allocated | KCOM Group Ltd |
| +44 1205535 | Allocated | GCI Network Solutions Limited |
| +44 1205536 | Protected | — |
| +44 1205537 | Protected | — |
| +44 1205538 | Protected | — |
| +44 1205539 | Protected | — |
| +44 1205540 | Allocated | Voxbone SA |
| +44 1205541 | Protected | — |
| +44 1205542 | Protected | — |
| +44 1205543 | Protected | — |
| +44 1205544 | Protected | — |
| +44 1205545 | Protected | — |
| +44 1205546 | Protected | — |
| +44 1205547 | Protected | — |
| +44 1205548 | Protected | — |
| +44 1205549 | Protected | — |
| +44 120555 | Protected | — |
| +44 1205560 | Allocated | Telecom2 Limited |
| +44 1205561 | Allocated | Telecom2 Limited |
| +44 1205562 | Protected | — |
| +44 1205563 | Protected | — |
| +44 1205564 | Protected | — |
| +44 1205565 | Protected | — |
| +44 1205566 | Protected | — |
| +44 1205567 | Protected | — |
| +44 1205568 | Protected | — |
| +44 1205569 | Protected | — |
| +44 1205570 | Allocated | Commi Holdings Limited |
| +44 1205571 | Allocated | Digital Space Group Limited |
| +44 1205572 | Allocated | Solutios Limited |
| +44 1205573 | Allocated | Lumen Technologies UK Limited |
| +44 1205574 | Allocated | Mars Communications Limited |
| +44 1205575 | Allocated | Nodemax Limited |
| +44 1205576 | Allocated | Wifinity Limited |
| +44 1205577 | Protected | — |
| +44 1205578 | Quarantined | — |
| +44 1205579 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 1205580 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1205581 | Allocated | Telecoms World Limited |
| +44 1205582 | Allocated | Invade International Ltd |
| +44 1205583 | Quarantined | — |
| +44 1205584 | Allocated | CFL Communications Ltd |
| +44 1205585 | Allocated | TeleWare Group Limited |
| +44 1205586 | Protected | — |
| +44 1205587 | Allocated | Nexus Telecommunications Limited |
| +44 1205588 | Allocated | Business Broadcast Communications Limited |
| +44 1205589 | Allocated | GCI Network Solutions Limited |
| +44 120559 | Allocated | BT |
| +44 1205600 | Allocated | Gamma Telecom Holdings Limited |
| +44 1205601 | Allocated | Datazero Ltd |
| +44 1205602 | Allocated | Atomstream Limited |
| +44 1205603 | Protected | — |
| +44 1205604 | Allocated | Digitech Solutions Global Limited |
| +44 1205605 | Allocated | Suretec Systems Ltd |
| +44 1205606 | Allocated | Telappliant Limited |
| +44 1205607 | Protected | — |
| +44 1205608 | Allocated | Calltracks Limited |
| +44 1205609 | Allocated | Sky UK Limited |
| +44 1205610 | Protected | — |
| +44 1205611 | Allocated | Content Guru Limited |
| +44 1205612 | Allocated | Sky UK Limited |
| +44 1205613 | Allocated | Media Hawk Ltd |
| +44 1205614 | Protected | — |
| +44 1205615 | Allocated | Kalnet4U Ltd |
| +44 1205616 | Allocated | Colt Technology Services |
| +44 1205617 | Allocated | XoverX Ltd |
| +44 1205618 | Protected | — |
| +44 1205619 | Allocated | TalkTalk Communications Limited |
| +44 1205620 | Allocated | Nuso Cloud UK Limited |
| +44 1205621 | Allocated | TalkTalk Communications Limited |
| +44 1205622 | Allocated | Fuse 2 Communications Ltd |
Related lookups
- 01406 Holbeach19 km away
- 01775 Spalding23 km away
- 01507 Louth23 km away
- 01790 Spilsby23 km away
- BT19 allocated blocks on 01205
- Sky UK Limited6 allocated blocks on 01205
- TalkTalk Communications Limited6 allocated blocks on 01205
- All UK towns A–ZDialling codes by town
- More Lincolnshire codesSame region
- All UK area codesBrowse every 01/02 dialling code
- Lookup any UK numberFree reverse phone lookup
- UK area codes explainedCornerstone guide
- 020 London numbers explainedCornerstone guide
- 0330 numbers explainedCornerstone guide
- How Ofcom allocates UK phone numbersCornerstone guide
FAQs about 01205
Where is area code 01205?
01205 is Ofcom's Boston numbering area, in Lincolnshire, East Midlands England. Its exchange town is in Lincolnshire. From abroad, drop the 0 and dial +44 1205.
Do I need to dial 01205 for a local call?
Traditionally not from another 01205 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01205 first always works, and mobiles always need it.
How are 01205 numbers written?
Numbers on 01205 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01205 234 567. From abroad the leading zero is dropped: +44 1205 then the local number.
What was the 01205 area code before?
01205 took its current form at PhONEday on 16 April 1995, when a "1" was inserted into every UK geographic code — before that the area dialled 0205. Old signage or stationery showing 0205 refers to the same Boston numbers.
Which phone companies hold 01205 numbers?
Ofcom lists 97 providers with allocated blocks on 01205. The largest are BT with 19 of the 136 allocated blocks, Sky UK Limited with 6 of the 136 allocated blocks and TalkTalk Communications Limited with 6 of the 136 allocated blocks. Numbers can be ported, so a number's current provider may differ from the block's holder.
Which area codes are next to 01205?
By distance between exchange towns, the nearest other codes are 01406 Holbeach (19 km), 01775 Spalding (23 km), 01507 Louth (23 km) and 01790 Spilsby (23 km).
How do I report a scam call from a 01205 number?
On a mobile, text the caller's number to 7726 (free). If you lost money or shared details, call your bank and report it to Report Fraud (0300 123 2040), which replaced Action Fraud in December 2025. Unwanted sales calls go to the ICO after registering with the Telephone Preference Service.