01858 Area Code — Market Harborough
01858 is the UK dialling code for Market Harborough in Leicestershire, also serving Desborough, Kibworth Harcourt and Fleckney, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 112 distinct 01858 numbers across 123 public lookups.
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Quick facts
Area code
01858
Location
Market Harborough
County
Leicestershire
Region
East Midlands
Number type
Geographic landline
Number format
01858 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01858 dialling code
01858 is the UK geographic dialling code for Market Harborough, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Market Harborough area.
A full Market Harborough number is normally written as 01858 XXXXXX. You can dial the local part on its own from within the same area, or the full number from anywhere in the UK.
Because of UK number portability and internet calling, a 01858 number no longer guarantees the caller is physically in Market Harborough. Fraudsters also "spoof" local codes like 01858 so an unknown call looks like a nearby business or neighbour — so treat an unexpected call on what is actually said, not on the area code alone.
Map of the 01858 dialling area
The marker shows Market Harborough; the shaded circle is an approximate indication of the area the 01858 code serves — exact Ofcom charging-area boundaries are irregular and don't follow a neat radius.
Map data © OpenStreetMap contributors. View larger map
Areas typically served by 01858
Settlements in and around the Market Harborough dialling area that typically use 01858 numbers. Approximate — Ofcom charging-area boundaries don't follow town or county lines exactly, and properties near a boundary may take a neighbouring code.
Calling 01858 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1858 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1858 … |
| Europe / most of the world | 00 44 1858 … |
| Australia | 0011 44 1858 … |
| Any mobile phone | +44 1858 … |
History of the 01858 code
The code was 0858 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01858.
Top searched 01858 numbers
These are the 01858 numbers most-looked-up by visitors to our number checker. Click any number to see its full lookup page with risk-level, range holder, and community reports.
| Number | Searches | Last looked up |
|---|---|---|
| 01858 372084 | 4 | 19 Jun 2026 |
| 01858 438884 | 3 | 6 Jul 2026 |
| 01858 431841 | 2 | 10 Jul 2026 |
| 01858 410008 | 2 | 2 Jul 2026 |
| 01858 894140 | 2 | 1 Jul 2026 |
| 01858 894207 | 2 | 1 Jul 2026 |
| 01858 783973 | 2 | 25 Jun 2026 |
| 01858 462154 | 2 | 20 Jun 2026 |
| 01858 468543 | 1 | 9 Jul 2026 |
| 01858 438838 | 1 | 1 Jul 2026 |
| 01858 894187 | 1 | 1 Jul 2026 |
| 01858 414717 | 1 | 30 Jun 2026 |
| 01858 894146 | 1 | 29 Jun 2026 |
| 01858 894199 | 1 | 29 Jun 2026 |
| 01858 431835 | 1 | 29 Jun 2026 |
| 01858 372118 | 1 | 29 Jun 2026 |
| 01858 438772 | 1 | 29 Jun 2026 |
| 01858 438836 | 1 | 29 Jun 2026 |
| 01858 431902 | 1 | 29 Jun 2026 |
| 01858 438833 | 1 | 29 Jun 2026 |
Is a call from 01858 safe?
Most 01858 calls are ordinary local calls from Market Harborough homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01858 prefix so you are more likely to answer. Never share bank details, passwords or one-time security codes with an unexpected caller, even when the number looks local — hang up and call the organisation back on a number you have verified yourself.
To call a 01858 (Market Harborough) number from outside the UK, drop the leading zero and dial +44 1858 followed by the local number.
Operators serving Market Harborough
These UK communications providers have been allocated 01858 number blocks by Ofcom. The number of blocks per operator gives a rough sense of how widely each provider serves this area.
| Provider (Ofcom-allocated) | Allocated blocks |
|---|---|
| BT | 14 |
| Barritel Limited | 9 |
| Vodafone Ltd (C&W) | 9 |
| Gamma Telecom Holdings Limited | 8 |
| GCI Network Solutions Limited | 8 |
| Magrathea Telecommunications Limited | 6 |
| TalkTalk Communications Limited | 3 |
| Colt Technology Services | 2 |
Ofcom number ranges on 01858
Ofcom's National Numbering Plan lists 406 number blocks under 01858, of which 148 are allocated to 94 communications providers. The first allocated blocks are shown below — look up any full number with the number checker to see its exact range holder.
| Number block | Status | Range holder (Ofcom-allocated) |
|---|---|---|
0185821… | Allocated | TelNG Limited |
0185822… | Allocated | TTNC Limited |
0185823… | Allocated | Localphone Limited |
0185824… | Allocated | (AQ) LIMITED |
0185826… | Allocated | Nationwide Telephone Assistance Ltd |
01858277… | Allocated | Spitfire Network Services Limited |
01858287… | Allocated | TalkTalk Communications Limited |
01858288… | Allocated | TalkTalk Communications Limited |
01858289… | Allocated | TalkTalk Communications Limited |
01858300… | Allocated | Net-Work Internet Ltd |
0185831… | Allocated | VoIP-Un Limited |
0185832… | Allocated | AQL Wholesale Ltd |
Showing 12 of 148 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01858 spam calls
Block or report 01858
- You can block 01858 directly from your recent-calls list on iPhone or Android, and forward scam texts free to 7726.
- Scam or fraud calls should be reported to Action Fraud (0300 123 2040) or Police Scotland (101); persistent marketing calls to the ICO / TPS.
Full step-by-step instructions for every phone, network-level blocking and all UK reporting routes are in our guide: How to block and report unwanted calls in the UK.
How to stop unwanted calls for good
Blocking 01858 numbers stops that one number, but determined nuisance callers simply switch numbers. Silencing unknown callers, enabling your network's free spam shield and registering with the TPS cut the volume across the board — our canonical guide walks through each step: How to block and report unwanted calls in the UK.
Frequently asked questions about the 01858 code
Where is the 01858 area code?
The 01858 area code is allocated by Ofcom to Market Harborough in Leicestershire, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Desborough, Kibworth Harcourt, Fleckney and nearby villages.
Is 01858 always a Market Harborough number?
Numbers with the 01858 prefix were originally allocated by Ofcom to Market Harborough. With UK number portability and VoIP allowing geographic relocation while keeping the same number, the call origin can differ from the original area, but the prefix's official assigned location remains Market Harborough.
How do I block 01858 spam calls?
On iPhone, tap the (i) next to the number in Recents and choose Block this Caller. On Android, long-press the number in Recents and choose Block. To prevent unknown 01858 numbers ringing, enable Settings → Phone → Silence Unknown Callers (iPhone) or your dialler's spam filter (Android). Forward spam texts to 7726 free of charge.
How much does a 01858 call cost?
Calls to UK 01858 geographic numbers are charged at your provider's standard rate and are usually included in inclusive minutes on any modern landline or mobile plan.
Neighbouring dialling codes
Codes covering areas around Market Harborough — useful when a caller is nearby but outside the 01858 boundary.
Living in or moving to Market Harborough?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Market Harborough.
Check another UK number
Have the full 10- or 11-digit number? The UK Phone Number Checker shows the Ofcom range holder, risk level, and any community reports for that specific number.