UK area code
01707 area code — Welwyn Garden City
01707 is Ofcom’s Welwyn Garden City numbering area, in Hertfordshire, East of England England. 110 phone companies hold its 228 allocated number blocks. Its numbers are written like 01707 234 567. The nearest other codes are 01727 St Albans (10 km) and 01920 Ware (11 km).
01707 at a glance
- Ofcom area name
- Welwyn Garden City
- County
- Hertfordshire
- Council area
- Hertfordshire
- Region
- East of England England
- Number format
- 01707 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0707)
- Allocated blocks
- 228 of 424 (54%) across 110 providers
- Newest block
- 17 March 2026 (3 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01707 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.
01707 history and number format
Number format: Numbers on 01707 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01707 234 567.
Before 1995: 01707 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 0707.
Local dialling: Traditionally not from another 01707 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01707 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01707 was allocated on 15 July 1994, and the most recent on 17 March 2026. 3 blocks were allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01707 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01707 numbers
Every Ofcom range holder with blocks on 01707, 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 | 33 | 33 | 15 July 1994 | 14 April 2022 |
| Gamma Telecom Holdings Limited | 17 | 17 | 19 November 2012 | 11 August 2025 |
| Verizon UK Limited | 11 | 11 | 9 October 2006 | 5 April 2019 |
| Sky UK Limited | 10 | 10 | 1 July 2013 | 4 August 2021 |
| Virgin Media Limited | 8 | 8 | 16 May 1995 | 27 June 2012 |
| GCI Network Solutions Limited | 7 | 7 | 25 April 2017 | 26 February 2024 |
| Magrathea Telecommunications Limited | 7 | 7 | 5 May 2010 | 15 November 2011 |
| Colt Technology Services | 6 | 6 | 12 September 2013 | 4 August 2022 |
| TalkTalk Communications Limited | 6 | 6 | 31 August 2011 | 9 November 2018 |
| Vodafone Ltd (C&W) | 6 | 6 | 14 October 2013 | 16 November 2021 |
| GTT-EMEA LTD | 5 | 5 | 13 October 2021 | 13 October 2021 |
| Lumen Technologies UK Limited | 3 | 3 | 26 July 2011 | 26 July 2011 |
| Calltracks Limited | 2 | 2 | 23 September 2013 | 22 December 2017 |
| DRD Communications Limited | 2 | 2 | 5 October 2023 | 5 October 2023 |
| Digital Space Group Limited | 2 | 2 | 20 May 2008 | 15 March 2016 |
| Digitech Solutions Global Limited | 2 | 2 | 28 April 2010 | 26 June 2012 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| IOVOX Limited | 2 | 2 | 4 July 2012 | 31 January 2017 |
| Nuso Cloud UK Limited | 2 | 2 | 13 January 2010 | 18 October 2022 |
| Served Up Limited | 2 | 2 | 1 March 2013 | 1 March 2013 |
| Six Degrees Technology Group Limited | 2 | 2 | 14 January 2020 | 14 January 2020 |
| Voiceflex Limited | 2 | 2 | 27 September 2007 | 13 October 2023 |
| Voxbone SA | 2 | 2 | 25 September 2008 | 25 February 2026 |
| (AQ) LIMITED | 1 | 1 | 12 September 2012 | 12 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 30 September 2019 | 30 September 2019 |
| 8x8 Communications UK Limited | 1 | 1 | 10 April 2012 | 10 April 2012 |
| AQL Wholesale Ltd | 1 | 1 | 1 November 2004 | 1 November 2004 |
| Adepteo Limited | 1 | 1 | 6 December 2016 | 6 December 2016 |
| Alnitak GmbH | 1 | 1 | 26 October 2016 | 26 October 2016 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 27 March 2009 | 27 March 2009 |
Showing the 30 largest of 110 holders.
All number blocks on 01707first 200 of 424, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 170700 | Protected | — |
| +44 170701 | Protected | — |
| +44 170702 | Protected | — |
| +44 170703 | Protected | — |
| +44 170704 | Protected | — |
| +44 170705 | Protected | — |
| +44 170706 | Protected | — |
| +44 170707 | Protected | — |
| +44 170708 | Protected | — |
| +44 170709 | Protected | — |
| +44 170710 | Allocated | BT |
| +44 1707110 | Protected | — |
| +44 1707111 | Protected | — |
| +44 1707112 | Protected | — |
| +44 1707113 | Protected | — |
| +44 1707114 | Protected | — |
| +44 1707115 | Protected | — |
| +44 1707116 | Protected | — |
| +44 1707117 | Protected | — |
| +44 1707118 | Protected | — |
| +44 1707119 | Protected | — |
| +44 170712 | Protected | — |
| +44 170713 | Protected | — |
| +44 170714 | Protected | — |
| +44 170715 | Protected | — |
| +44 170716 | Protected | — |
| +44 170717 | Protected | — |
| +44 170718 | Protected | — |
| +44 170719 | Protected | — |
| +44 170720 | Allocated | Vodafone Ltd (C&W) |
| +44 170721 | Protected | — |
| +44 170722 | Allocated | Vodafone Ltd (C&W) |
| +44 1707230 | Allocated | Lumen Technologies UK Limited |
| +44 1707231 | Protected | — |
| +44 1707232 | Protected | — |
| +44 1707233 | Allocated | Lumen Technologies UK Limited |
| +44 1707234 | Protected | — |
| +44 1707235 | Protected | — |
| +44 1707236 | Protected | — |
| +44 1707237 | Protected | — |
| +44 1707238 | Protected | — |
| +44 1707239 | Allocated | Lumen Technologies UK Limited |
| +44 1707240 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707241 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707242 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707243 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707244 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707245 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707246 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707247 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707248 | Allocated | Gamma Telecom Holdings Limited |
| +44 1707249 | Protected | — |
| +44 170725 | Allocated | BT |
| +44 170726 | Allocated | BT |
| +44 170727 | Allocated | BT |
| +44 170728 | Allocated | BT |
| +44 170729 | Allocated | BT |
| +44 170730 | Allocated | Vodafone Ltd (C&W) |
| +44 170731 | Allocated | EE Limited ( TM) |
| +44 170732 | Allocated | BT |
| +44 170733 | Allocated | BT |
| +44 170734 | Allocated | BT |
| +44 170735 | Allocated | BT |
| +44 170736 | Allocated | BT |
| +44 170737 | Allocated | BT |
| +44 170738 | Allocated | BT |
| +44 170739 | Allocated | BT |
| +44 170740 | Allocated | Citrus Telecommunications Ltd |
| +44 1707410 | Allocated | Linear Telecoms Limited |
| +44 1707411 | Allocated | HAVENSTOKE COMMUNICATIONS LTD |
| +44 1707412 | Allocated | Internexus Networks Limited |
| +44 1707413 | Allocated | Hello Telecom (UK) Limited |
| +44 1707414 | Allocated | Orbtalk Limited |
| +44 1707415 | Allocated | Bicom Systems EURL |
| +44 1707416 | Protected | — |
| +44 1707417 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1707418 | Allocated | 8x8 Communications UK Limited |
| +44 1707419 | Allocated | ICC Networks Ltd |
| +44 170742 | Allocated | Vodafone Ltd (C&W) |
| +44 1707430 | Allocated | Six Degrees Technology Group Limited |
| +44 1707431 | Protected | — |
| +44 1707432 | Protected | — |
| +44 1707433 | Protected | — |
| +44 1707434 | Allocated | Six Degrees Technology Group Limited |
| +44 1707435 | Protected | — |
| +44 1707436 | Protected | — |
| +44 1707437 | Protected | — |
| +44 1707438 | Protected | — |
| +44 1707439 | Protected | — |
| +44 1707440 | Allocated | Sky UK Limited |
| +44 1707441 | Allocated | TelNG Limited |
| +44 1707442 | Allocated | Localphone Limited |
| +44 1707443 | Allocated | Voiceflex Limited |
| +44 1707444 | Allocated | Digital Mail Limited |
| +44 1707445 | Allocated | (AQ) LIMITED |
| +44 1707446 | Allocated | Redcentric Solutions Limited |
| +44 1707447 | Allocated | Net-Work Internet Ltd |
| +44 1707448 | Allocated | VoIP-Un Limited |
| +44 1707449 | Allocated | Resilient Limited |
| +44 170745 | Allocated | GCI Network Solutions Limited |
| +44 1707460 | Allocated | GTT-EMEA LTD |
| +44 1707461 | Protected | — |
| +44 1707462 | Allocated | GTT-EMEA LTD |
| +44 1707463 | Protected | — |
| +44 1707464 | Protected | — |
| +44 1707465 | Protected | — |
| +44 1707466 | Allocated | GTT-EMEA LTD |
| +44 1707467 | Allocated | GTT-EMEA LTD |
| +44 1707468 | Protected | — |
| +44 1707469 | Allocated | GTT-EMEA LTD |
| +44 1707470 | Allocated | DRD Communications Limited |
| +44 1707471 | Allocated | DRD Communications Limited |
| +44 1707472 | Protected | — |
| +44 1707473 | Protected | — |
| +44 1707474 | Protected | — |
| +44 1707475 | Protected | — |
| +44 1707476 | Protected | — |
| +44 1707477 | Protected | — |
| +44 1707478 | Protected | — |
| +44 1707479 | Protected | — |
| +44 170748 | Allocated | C2C Limited |
| +44 1707490 | Protected | — |
| +44 1707491 | Protected | — |
| +44 1707492 | Protected | — |
| +44 1707493 | Protected | — |
| +44 1707494 | Protected | — |
| +44 1707495 | Protected | — |
| +44 1707496 | Protected | — |
| +44 1707497 | Allocated | Spitfire Network Services Limited |
| +44 1707498 | Protected | — |
| +44 1707499 | Protected | — |
| +44 170750 | Allocated | Simwood eSMS Limited |
| +44 1707510 | Protected | — |
| +44 1707511 | Allocated | Verizon UK Limited |
| +44 1707512 | Allocated | Barritel Limited |
| +44 1707513 | Allocated | Digital Space Group Limited |
| +44 1707514 | Allocated | Nodemax Limited |
| +44 1707515 | Allocated | TTNC Limited |
| +44 1707516 | Allocated | Telecom2 Limited |
| +44 1707517 | Allocated | Digital Space Group Limited |
| +44 1707518 | Allocated | TalkTalk Communications Limited |
| +44 1707519 | Allocated | Nationwide Telephone Assistance Ltd |
| +44 1707520 | Allocated | TalkTalk Communications Limited |
| +44 1707521 | Protected | — |
| +44 1707522 | Allocated | Pulsant (Scotland) Limited |
| +44 1707523 | Protected | — |
| +44 1707524 | Allocated | Voxbone SA |
| +44 1707525 | Allocated | Solutios Limited |
| +44 1707526 | Allocated | Mars Communications Limited |
| +44 1707527 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1707528 | Quarantined | — |
| +44 1707529 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 1707530 | Allocated | CFL Communications Ltd |
| +44 1707531 | Allocated | Nexus Telecommunications Limited |
| +44 1707532 | Allocated | Telecoms World Limited |
| +44 1707533 | Allocated | Magrathea Telecommunications Limited |
| +44 1707534 | Quarantined | — |
| +44 1707535 | Allocated | GCI Network Solutions Limited |
| +44 1707536 | Allocated | TeleWare Group Limited |
| +44 1707537 | Allocated | Nuso Cloud UK Limited |
| +44 1707538 | Allocated | Buzz Networks Limited |
| +44 1707539 | Allocated | Atomstream Limited |
| +44 170754 | Protected | — |
| +44 1707550 | Allocated | Sky UK Limited |
| +44 1707551 | Allocated | Sky UK Limited |
| +44 1707552 | Allocated | Sky UK Limited |
| +44 1707553 | Protected | — |
| +44 1707554 | Protected | — |
| +44 1707555 | Protected | — |
| +44 1707556 | Protected | — |
| +44 1707557 | Protected | — |
| +44 1707558 | Protected | — |
| +44 1707559 | Protected | — |
| +44 1707560 | Allocated | Digitech Solutions Global Limited |
| +44 1707561 | Allocated | Calltracks Limited |
| +44 1707562 | Allocated | Core Telecom Limited |
| +44 1707563 | Allocated | Telephone Box Limited |
| +44 1707564 | Protected | — |
| +44 1707565 | Allocated | Suretec Systems Ltd |
| +44 1707566 | Allocated | Telappliant Limited |
| +44 1707567 | Allocated | Windsor Telecom Limited |
| +44 1707568 | Allocated | Datazero Ltd |
| +44 1707569 | Allocated | Phone Co-Op Numbering Limited |
| +44 1707570 | Protected | — |
| +44 1707571 | Protected | — |
| +44 1707572 | Protected | — |
| +44 1707573 | Protected | — |
| +44 1707574 | Protected | — |
| +44 1707575 | Protected | — |
| +44 1707576 | Protected | — |
| +44 1707577 | Protected | — |
| +44 1707578 | Protected | — |
| +44 1707579 | Protected | — |
| +44 1707580 | Protected | — |
| +44 1707581 | Allocated | Invosys Limited |
| +44 1707582 | Allocated | Minotaur Telecom Limited |
| +44 1707583 | Allocated | Nexbridge Communications Limited |
| +44 1707584 | Protected | — |
| +44 1707585 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1707586 | Allocated | Sky UK Limited |
Related lookups
- 01727 St Albans10 km away
- 01920 Ware11 km away
- 01438 Stevenage12 km away
- 01992 Lea Valley13 km away
- BT33 allocated blocks on 01707
- Gamma Telecom Holdings Limited17 allocated blocks on 01707
- Verizon UK Limited11 allocated blocks on 01707
- All UK towns A–ZDialling codes by town
- More Hertfordshire 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 01707
Where is area code 01707?
01707 is Ofcom's Welwyn Garden City numbering area, in Hertfordshire, East of England England. Its exchange town is in Hertfordshire. From abroad, drop the 0 and dial +44 1707.
Do I need to dial 01707 for a local call?
Traditionally not from another 01707 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01707 first always works, and mobiles always need it.
How are 01707 numbers written?
Numbers on 01707 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01707 234 567. From abroad the leading zero is dropped: +44 1707 then the local number.
What was the 01707 area code before?
01707 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 0707. Old signage or stationery showing 0707 refers to the same Welwyn Garden City numbers.
Which phone companies hold 01707 numbers?
Ofcom lists 110 providers with allocated blocks on 01707. The largest are BT with 33 of the 228 allocated blocks, Gamma Telecom Holdings Limited with 17 of the 228 allocated blocks and Verizon UK Limited with 11 of the 228 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 01707?
By distance between exchange towns, the nearest other codes are 01727 St Albans (10 km), 01920 Ware (11 km), 01438 Stevenage (12 km) and 01992 Lea Valley (13 km).
How do I report a scam call from a 01707 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.