01403 Area Code — Horsham, Southwater & Warnham
01403 is the UK dialling code for Horsham in West Sussex, also serving Southwater, Warnham and Rudgwick, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 218 distinct 01403 numbers across 263 public lookups.
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Quick facts
Area code
01403
Location
Horsham
County
West Sussex
Region
South East England
Number type
Geographic landline
Number format
01403 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01403 dialling code
01403 is the UK geographic dialling code for Horsham, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Horsham area.
A full Horsham number is normally written as 01403 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 01403 number no longer guarantees the caller is physically in Horsham. Fraudsters also "spoof" local codes like 01403 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 01403 dialling area
The marker shows Horsham; the shaded circle is an approximate indication of the area the 01403 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 01403
Settlements in and around the Horsham dialling area that typically use 01403 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 01403 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1403 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1403 … |
| Europe / most of the world | 00 44 1403 … |
| Australia | 0011 44 1403 … |
| Any mobile phone | +44 1403 … |
History of the 01403 code
The code was 0403 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01403.
Top searched 01403 numbers
These are the 01403 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 |
|---|---|---|
| 01403 605984 | 5 | 9 Jul 2026 |
| 01403 581281 | 4 | 18 Jun 2026 |
| 01403 332606 | 3 | 10 Jul 2026 |
| 01403 605977 | 3 | 6 Jul 2026 |
| 01403 605995 | 3 | 29 Jun 2026 |
| 01403 605990 | 3 | 25 Jun 2026 |
| 01403 586029 | 3 | 22 Jun 2026 |
| 01403 456627 | 2 | 11 Jul 2026 |
| 01403 605954 | 2 | 9 Jul 2026 |
| 01403 627880 | 2 | 8 Jul 2026 |
| 01403 261039 | 2 | 6 Jul 2026 |
| 01403 741385 | 2 | 5 Jul 2026 |
| 01403 546132 | 2 | 5 Jul 2026 |
| 01403 282278 | 2 | 4 Jul 2026 |
| 01403 271525 | 2 | 4 Jul 2026 |
| 01403 271530 | 2 | 4 Jul 2026 |
| 01403 458408 | 2 | 4 Jul 2026 |
| 01403 731795 | 2 | 3 Jul 2026 |
| 01403 627892 | 2 | 3 Jul 2026 |
| 01403 271520 | 2 | 3 Jul 2026 |
Is a call from 01403 safe?
Most 01403 calls are ordinary local calls from Horsham homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01403 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 01403 (Horsham) number from outside the UK, drop the leading zero and dial +44 1403 followed by the local number.
Operators serving Horsham
These UK communications providers have been allocated 01403 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 | 26 |
| Vodafone Ltd (C&W) | 18 |
| 1XXXX | 10 |
| Gamma Telecom Holdings Limited | 8 |
| Sky UK Limited | 8 |
| TalkTalk Communications Limited | 5 |
| Colt Technology Services | 4 |
| GCI Network Solutions Limited | 3 |
Ofcom number ranges on 01403
Ofcom's National Numbering Plan lists 460 number blocks under 01403, of which 174 are allocated to 100 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) |
|---|---|---|
0140303… | Allocated | Vodafone Ltd (C&W) |
0140321… | Allocated | BT |
0140322… | Allocated | BT |
0140323… | Allocated | BT |
0140324… | Allocated | BT |
0140325… | Allocated | BT |
0140326… | Allocated | BT |
0140327… | Allocated | BT |
0140328… | Allocated | BT |
0140329… | Allocated | TTNC Limited |
0140330… | Allocated | Redcentric Solutions Limited |
0140331… | Allocated | Served Up Limited |
Showing 12 of 174 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
Common scam patterns reported in Horsham
Categories most-commonly tagged on user-submitted reports for 01403 numbers in our community comments.
- silent — 1 report
How to block and report 01403 spam calls
Block or report 01403
- You can block 01403 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 01403 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 01403 code
Where is the 01403 area code?
The 01403 area code is allocated by Ofcom to Horsham in West Sussex, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Southwater, Warnham, Rudgwick and nearby villages.
Is 01403 always a Horsham number?
Numbers with the 01403 prefix were originally allocated by Ofcom to Horsham. 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 Horsham.
How do I block 01403 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 01403 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 01403 call cost?
Calls to UK 01403 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 Horsham — useful when a caller is nearby but outside the 01403 boundary.
Living in or moving to Horsham?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Horsham.
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.