01707 Area Code — Welwyn Garden City, Hatfield & Codicote
01707 is the UK dialling code for Welwyn Garden City in Hertfordshire, also serving Hatfield, Codicote and Welwyn, allocated by Ofcom under the National Telephone Numbering Plan. Our database has tracked 253 distinct 01707 numbers across 371 public lookups.
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Quick facts
Area code
01707
Location
Welwyn Garden City
County
Hertfordshire
Region
East of England
Number type
Geographic landline
Number format
01707 XXX XXX
Operators serving
8+
Call cost
Standard rate
About the 01707 dialling code
01707 is the UK geographic dialling code for Welwyn Garden City, allocated by Ofcom under the National Telephone Numbering Plan. It is used by landlines — and increasingly VoIP lines — registered to the Welwyn Garden City area.
A full Welwyn Garden City number is normally written as 01707 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 01707 number no longer guarantees the caller is physically in Welwyn Garden City. Fraudsters also "spoof" local codes like 01707 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 01707 dialling area
The marker shows Welwyn Garden City; the shaded circle is an approximate indication of the area the 01707 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 01707
Settlements in and around the Welwyn Garden City dialling area that typically use 01707 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 01707 from abroad
From outside the UK, dial your international access prefix, then the UK country code 44, then 1707 (the area code without its leading zero) and the local number.
| Calling from | Dial |
|---|---|
| United States & Canada | 011 44 1707 … |
| Europe / most of the world | 00 44 1707 … |
| Australia | 0011 44 1707 … |
| Any mobile phone | +44 1707 … |
History of the 01707 code
The code was 0707 until PhONEday, 16 April 1995, when a "1" was inserted after the leading zero to create 01707.
Top searched 01707 numbers
These are the 01707 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 |
|---|---|---|
| 01707 942930 | 10 | 7 Jul 2026 |
| 01707 942933 | 9 | 30 Jun 2026 |
| 01707 942944 | 7 | 1 Jul 2026 |
| 01707 242967 | 6 | 26 Jun 2026 |
| 01707 942943 | 6 | 17 Jun 2026 |
| 01707 939314 | 6 | 17 Jun 2026 |
| 01707 247200 | 6 | 9 Jun 2026 |
| 01707 583945 | 5 | 12 Jul 2026 |
| 01707 942935 | 5 | 4 Jul 2026 |
| 01707 942932 | 5 | 24 Jun 2026 |
| 01707 939341 | 4 | 12 Jul 2026 |
| 01707 942934 | 4 | 7 Jul 2026 |
| 01707 942929 | 4 | 4 Jul 2026 |
| 01707 299334 | 4 | 4 Jul 2026 |
| 01707 935425 | 4 | 30 Jun 2026 |
| 01707 331414 | 4 | 19 Jun 2026 |
| 01707 246962 | 3 | 12 Jul 2026 |
| 01707 255140 | 3 | 11 Jul 2026 |
| 01707 942938 | 3 | 8 Jul 2026 |
| 01707 942755 | 3 | 7 Jul 2026 |
Is a call from 01707 safe?
Most 01707 calls are ordinary local calls from Welwyn Garden City homes and businesses. The main risk to be aware of is "neighbour spoofing", where a scammer fakes a local 01707 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 01707 (Welwyn Garden City) number from outside the UK, drop the leading zero and dial +44 1707 followed by the local number.
Operators serving Welwyn Garden City
These UK communications providers have been allocated 01707 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 | 33 |
| Gamma Telecom Holdings Limited | 17 |
| Verizon UK Limited | 11 |
| Sky UK Limited | 10 |
| Virgin Media Limited | 8 |
| Magrathea Telecommunications Limited | 7 |
| GCI Network Solutions Limited | 7 |
| Vodafone Ltd (C&W) | 6 |
Ofcom number ranges on 01707
Ofcom's National Numbering Plan lists 424 number blocks under 01707, of which 230 are allocated to 112 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) |
|---|---|---|
0170710… | Allocated | BT |
0170720… | Allocated | Vodafone Ltd (C&W) |
0170722… | Allocated | Vodafone Ltd (C&W) |
01707230… | Allocated | Lumen Technologies UK Limited |
01707233… | Allocated | Lumen Technologies UK Limited |
01707239… | Allocated | Lumen Technologies UK Limited |
01707240… | Allocated | Gamma Telecom Holdings Limited |
01707241… | Allocated | Gamma Telecom Holdings Limited |
01707242… | Allocated | Gamma Telecom Holdings Limited |
01707243… | Allocated | Gamma Telecom Holdings Limited |
01707244… | Allocated | Gamma Telecom Holdings Limited |
01707245… | Allocated | Gamma Telecom Holdings Limited |
Showing 12 of 230 allocated blocks. Source: Ofcom telephone numbering data, updated weekly.
How to block and report 01707 spam calls
Block or report 01707
- You can block 01707 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 01707 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 01707 code
Where is the 01707 area code?
The 01707 area code is allocated by Ofcom to Welwyn Garden City in Hertfordshire, United Kingdom. It is a geographic UK landline dialling code under the National Telephone Numbering Plan. The surrounding dialling area also takes in Hatfield, Codicote, Welwyn and nearby villages.
Is 01707 always a Welwyn Garden City number?
Numbers with the 01707 prefix were originally allocated by Ofcom to Welwyn Garden City. 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 Welwyn Garden City.
How do I block 01707 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 01707 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 01707 call cost?
Calls to UK 01707 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 Welwyn Garden City — useful when a caller is nearby but outside the 01707 boundary.
Living in or moving to Welwyn Garden City?
Our free postcode reports cover house prices, crime, broadband and schools for the districts around Welwyn Garden City.
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.