UK area code
01858 area code — Market Harborough
01858 is Ofcom’s Market Harborough numbering area, in Leicestershire, East Midlands England. 92 phone companies hold its 146 allocated number blocks. Its numbers are written like 01858 234 567. The nearest other codes are 01536 Kettering (16 km) and 01604 Northampton (22 km).
01858 at a glance
- Ofcom area name
- Market Harborough
- County
- Leicestershire
- Council area
- Leicestershire
- Region
- East Midlands England
- Number format
- 01858 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0858)
- Allocated blocks
- 146 of 406 (36%) across 92 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 01858 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.
01858 history and number format
Number format: Numbers on 01858 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01858 234 567.
Before 1995: 01858 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 0858.
Local dialling: Traditionally not from another 01858 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01858 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01858 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 01858 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01858 numbers
Every Ofcom range holder with blocks on 01858, 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 | 14 | 14 | 15 July 1994 | 21 July 2021 |
| Barritel Limited | 9 | 9 | 15 November 2011 | 15 November 2011 |
| Vodafone Ltd (C&W) | 9 | 9 | 6 September 2013 | 12 November 2021 |
| GCI Network Solutions Limited | 8 | 8 | 2 May 2017 | 26 February 2024 |
| Gamma Telecom Holdings Limited | 8 | 8 | 19 November 2012 | 19 November 2012 |
| Magrathea Telecommunications Limited | 6 | 6 | 18 November 2011 | 18 November 2011 |
| TalkTalk Communications Limited | 3 | 3 | 31 August 2011 | 31 August 2011 |
| Colt Technology Services | 2 | 2 | 7 May 2015 | 11 November 2019 |
| Digital Space Group Limited | 2 | 2 | 23 May 2008 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| Served Up Limited | 2 | 2 | 1 March 2013 | 1 March 2013 |
| (AQ) LIMITED | 1 | 1 | 26 September 2012 | 26 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 18 April 2012 | 18 April 2012 |
| AQL Wholesale Ltd | 1 | 1 | 3 January 2008 | 3 January 2008 |
| Adepteo Limited | 1 | 1 | 29 November 2016 | 29 November 2016 |
| Alnitak GmbH | 1 | 1 | 31 August 2016 | 31 August 2016 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 7 September 2011 | 7 September 2011 |
| Atomstream Limited | 1 | 1 | 12 April 2010 | 12 April 2010 |
| Belgacom International Carrier Services SA | 1 | 1 | 9 April 2020 | 9 April 2020 |
| Bicom Systems EURL | 1 | 1 | 2 March 2012 | 2 March 2012 |
| Bink Networks Ltd | 1 | 1 | 11 April 2023 | 11 April 2023 |
| CFL Communications Ltd | 1 | 1 | 17 July 2009 | 17 July 2009 |
| Calltracks Limited | 1 | 1 | 20 September 2013 | 20 September 2013 |
| Content Guru Limited | 1 | 1 | 11 October 2012 | 11 October 2012 |
| Convergence Group (wireless) Networks Limited | 1 | 1 | 21 May 2019 | 21 May 2019 |
| Core Telecom Limited | 1 | 1 | 6 August 2010 | 6 August 2010 |
| DIDWW Ireland Limited | 1 | 1 | 27 January 2020 | 27 January 2020 |
| Datazero Ltd | 1 | 1 | 12 November 2010 | 12 November 2010 |
| Dial 9 Communications Limited | 1 | 1 | 8 January 2020 | 8 January 2020 |
Showing the 30 largest of 92 holders.
Openreach exchanges at Market Harborough
Exchanges Openreach lists at this location in its copper stop-sell programme, with the date new copper orders stop.
- Market Harborough (MGA) EMMRKTHStop sell 06-Nov-25 · Tranche 18
All number blocks on 01858first 200 of 406, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 185800 | Protected | — |
| +44 185801 | Protected | — |
| +44 185802 | Protected | — |
| +44 185803 | Protected | — |
| +44 185804 | Protected | — |
| +44 185805 | Protected | — |
| +44 185806 | Protected | — |
| +44 185807 | Protected | — |
| +44 185808 | Protected | — |
| +44 185809 | Protected | — |
| +44 185810 | Protected | — |
| +44 185811 | Protected | — |
| +44 185812 | Protected | — |
| +44 185813 | Protected | — |
| +44 185814 | Protected | — |
| +44 185815 | Protected | — |
| +44 185816 | Protected | — |
| +44 185817 | Protected | — |
| +44 185818 | Protected | — |
| +44 185819 | Protected | — |
| +44 1858200 | Protected | — |
| +44 1858201 | Protected | — |
| +44 1858202 | Protected | — |
| +44 1858203 | Protected | — |
| +44 1858204 | Protected | — |
| +44 1858205 | Protected | — |
| +44 1858206 | Protected | — |
| +44 1858207 | Protected | — |
| +44 1858208 | Protected | — |
| +44 1858209 | Protected | — |
| +44 185821 | Allocated | TelNG Limited |
| +44 185822 | Allocated | TTNC Limited |
| +44 185823 | Allocated | Localphone Limited |
| +44 185824 | Allocated | (AQ) LIMITED |
| +44 185825 | Protected | — |
| +44 185826 | Allocated | Nationwide Telephone Assistance Ltd |
| +44 1858270 | Protected | — |
| +44 1858271 | Protected | — |
| +44 1858272 | Protected | — |
| +44 1858273 | Protected | — |
| +44 1858274 | Protected | — |
| +44 1858275 | Protected | — |
| +44 1858276 | Protected | — |
| +44 1858277 | Allocated | Spitfire Network Services Limited |
| +44 1858278 | Protected | — |
| +44 1858279 | Protected | — |
| +44 1858280 | Protected | — |
| +44 1858281 | Protected | — |
| +44 1858282 | Protected | — |
| +44 1858283 | Protected | — |
| +44 1858284 | Protected | — |
| +44 1858285 | Protected | — |
| +44 1858286 | Protected | — |
| +44 1858287 | Allocated | TalkTalk Communications Limited |
| +44 1858288 | Allocated | TalkTalk Communications Limited |
| +44 1858289 | Allocated | TalkTalk Communications Limited |
| +44 1858290 | Protected | — |
| +44 1858291 | Protected | — |
| +44 1858292 | Protected | — |
| +44 1858293 | Protected | — |
| +44 1858294 | Protected | — |
| +44 1858295 | Protected | — |
| +44 1858296 | Protected | — |
| +44 1858297 | Protected | — |
| +44 1858298 | Protected | — |
| +44 1858299 | Protected | — |
| +44 1858300 | Allocated | Net-Work Internet Ltd |
| +44 1858301 | Protected | — |
| +44 1858302 | Protected | — |
| +44 1858303 | Protected | — |
| +44 1858304 | Protected | — |
| +44 1858305 | Protected | — |
| +44 1858306 | Protected | — |
| +44 1858307 | Protected | — |
| +44 1858308 | Protected | — |
| +44 1858309 | Protected | — |
| +44 185831 | Allocated | VoIP-Un Limited |
| +44 185832 | Allocated | AQL Wholesale Ltd |
| +44 185833 | Allocated | Redcentric Solutions Limited |
| +44 185834 | Allocated | Telecom2 Limited |
| +44 185835 | Allocated | Digital Space Group Limited |
| +44 185836 | Allocated | Nodemax Limited |
| +44 1858370 | Allocated | Dial 9 Communications Limited |
| +44 1858371 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1858372 | Allocated | DIDWW Ireland Limited |
| +44 1858373 | Allocated | VOXYONDER NETWORK SERVICES UK LTD |
| +44 1858374 | Allocated | BT |
| +44 1858375 | Free | — |
| +44 1858376 | Free | — |
| +44 1858377 | Allocated | Lanonyx Telecom Limited |
| +44 1858378 | Allocated | Colt Technology Services |
| +44 1858379 | Free | — |
| +44 185838 | Allocated | Voiceflex Limited |
| +44 1858390 | Allocated | Voxbone SA |
| +44 1858391 | Protected | — |
| +44 1858392 | Protected | — |
| +44 1858393 | Protected | — |
| +44 1858394 | Protected | — |
| +44 1858395 | Protected | — |
| +44 1858396 | Protected | — |
| +44 1858397 | Protected | — |
| +44 1858398 | Protected | — |
| +44 1858399 | Protected | — |
| +44 1858400 | Allocated | Linear Telecoms Limited |
| +44 1858401 | Allocated | Minotaur Telecom Limited |
| +44 1858402 | Allocated | Orbtalk Limited |
| +44 1858403 | Protected | — |
| +44 1858404 | Protected | — |
| +44 1858405 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1858406 | Allocated | Internexus Networks Limited |
| +44 1858407 | Allocated | Hello Telecom (UK) Limited |
| +44 1858408 | Allocated | Simwood eSMS Limited |
| +44 1858409 | Allocated | Bicom Systems EURL |
| +44 185841 | Allocated | BT |
| +44 185842 | Allocated | Lumen Technologies UK Limited |
| +44 185843 | Allocated | BT |
| +44 185844 | Allocated | Virgin Media Limited |
| +44 1858450 | Allocated | Gamma Telecom Holdings Limited |
| +44 1858451 | Allocated | Gamma Telecom Holdings Limited |
| +44 1858452 | Allocated | Gamma Telecom Holdings Limited |
| +44 1858453 | Protected | — |
| +44 1858454 | Protected | — |
| +44 1858455 | Allocated | Gamma Telecom Holdings Limited |
| +44 1858456 | Allocated | Gamma Telecom Holdings Limited |
| +44 1858457 | Allocated | Gamma Telecom Holdings Limited |
| +44 1858458 | Allocated | Gamma Telecom Holdings Limited |
| +44 1858459 | Allocated | Gamma Telecom Holdings Limited |
| +44 185846 | Allocated | BT |
| +44 185847 | Allocated | BT |
| +44 1858480 | Protected | — |
| +44 1858481 | Protected | — |
| +44 1858482 | Protected | — |
| +44 1858483 | Protected | — |
| +44 1858484 | Protected | — |
| +44 1858485 | Protected | — |
| +44 1858486 | Protected | — |
| +44 1858487 | Protected | — |
| +44 1858488 | Allocated | Vodafone Ltd (C&W) |
| +44 1858489 | Protected | — |
| +44 185849 | Allocated | Flextel Limited |
| +44 1858500 | Protected | — |
| +44 1858501 | Protected | — |
| +44 1858502 | Protected | — |
| +44 1858503 | Protected | — |
| +44 1858504 | Protected | — |
| +44 1858505 | Protected | — |
| +44 1858506 | Protected | — |
| +44 1858507 | Protected | — |
| +44 1858508 | Protected | — |
| +44 1858509 | Protected | — |
| +44 1858510 | Allocated | Digitech Solutions Global Limited |
| +44 1858511 | Protected | — |
| +44 1858512 | Allocated | 8x8 Communications UK Limited |
| +44 1858513 | Allocated | IOVOX Limited |
| +44 1858514 | Protected | — |
| +44 1858515 | Allocated | Invoco Ltd |
| +44 1858516 | Allocated | ICC Networks Ltd |
| +44 1858517 | Allocated | Ziron Limited |
| +44 1858518 | Allocated | Content Guru Limited |
| +44 1858519 | Protected | — |
| +44 185852 | Allocated | BT |
| +44 185853 | Allocated | BT |
| +44 185854 | Allocated | BT |
| +44 185855 | Allocated | BT |
| +44 185856 | Allocated | BT |
| +44 185857 | Allocated | BT |
| +44 1858580 | Allocated | GCI Network Solutions Limited |
| +44 1858581 | Allocated | GCI Network Solutions Limited |
| +44 1858582 | Allocated | GCI Network Solutions Limited |
| +44 1858583 | Protected | — |
| +44 1858584 | Protected | — |
| +44 1858585 | Allocated | GCI Network Solutions Limited |
| +44 1858586 | Protected | — |
| +44 1858587 | Protected | — |
| +44 1858588 | Allocated | GCI Network Solutions Limited |
| +44 1858589 | Allocated | GCI Network Solutions Limited |
| +44 185859 | Protected | — |
| +44 185860 | Protected | — |
| +44 185861 | Protected | — |
| +44 1858620 | Allocated | Barritel Limited |
| +44 1858621 | Allocated | Barritel Limited |
| +44 1858622 | Allocated | Barritel Limited |
| +44 1858623 | Allocated | Barritel Limited |
| +44 1858624 | Allocated | Barritel Limited |
| +44 1858625 | Allocated | Barritel Limited |
| +44 1858626 | Allocated | Barritel Limited |
| +44 1858627 | Allocated | Barritel Limited |
| +44 1858628 | Allocated | Barritel Limited |
| +44 1858629 | Protected | — |
| +44 1858630 | Protected | — |
| +44 1858631 | Protected | — |
| +44 1858632 | Protected | — |
| +44 1858633 | Protected | — |
| +44 1858634 | Protected | — |
| +44 1858635 | Protected | — |
| +44 1858636 | Protected | — |
| +44 1858637 | Protected | — |
| +44 1858638 | Allocated | Served Up Limited |
| +44 1858639 | Allocated | Served Up Limited |
| +44 185864 | Allocated | Solutios Limited |
Related lookups
- 01536 Kettering16 km away
- 01604 Northampton22 km away
- 0116 Leicester23 km away
- 01933 Wellingborough25 km away
- BT14 allocated blocks on 01858
- Barritel Limited9 allocated blocks on 01858
- Vodafone Ltd (C&W)9 allocated blocks on 01858
- All UK towns A–ZDialling codes by town
- More Leicestershire 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 01858
Where is area code 01858?
01858 is Ofcom's Market Harborough numbering area, in Leicestershire, East Midlands England. Its exchange town is in Leicestershire. From abroad, drop the 0 and dial +44 1858.
Do I need to dial 01858 for a local call?
Traditionally not from another 01858 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01858 first always works, and mobiles always need it.
How are 01858 numbers written?
Numbers on 01858 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01858 234 567. From abroad the leading zero is dropped: +44 1858 then the local number.
What was the 01858 area code before?
01858 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 0858. Old signage or stationery showing 0858 refers to the same Market Harborough numbers.
Which phone companies hold 01858 numbers?
Ofcom lists 92 providers with allocated blocks on 01858. The largest are BT with 14 of the 146 allocated blocks, Barritel Limited with 9 of the 146 allocated blocks and Vodafone with 9 of the 146 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 01858?
By distance between exchange towns, the nearest other codes are 01536 Kettering (16 km), 01604 Northampton (22 km), 0116 Leicester (23 km) and 01933 Wellingborough (25 km).
How do I report a scam call from a 01858 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.