UK area code
01720 area code — Isles of Scilly
01720 is Ofcom’s Isles of Scilly numbering area, in Cornwall, South West England. 77 phone companies hold its 81 allocated number blocks. Its numbers are written like 01720 234 567. The nearest other codes are 01736 Penzance (60 km) and 01209 Redruth (85 km).
01720 at a glance
- Ofcom area name
- Isles of Scilly
- County
- Cornwall
- Council area
- Isles of Scilly
- Region
- South West England
- Number format
- 01720 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0720)
- Allocated blocks
- 81 of 523 (15%) across 77 providers
- Newest block
- 29 June 2026 (1 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01720 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.
01720 history and number format
Number format: Numbers on 01720 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01720 234 567.
Before 1995: 01720 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 0720.
Local dialling: Traditionally not from another 01720 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01720 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01720 was allocated on 15 July 1994, and the most recent on 29 June 2026. 1 block was allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01720 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01720 numbers
Every Ofcom range holder with blocks on 01720, 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 |
|---|---|---|---|---|
| Digital Space Group Limited | 2 | 2 | 20 May 2008 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 3 July 2017 | 22 January 2024 |
| Simwood eSMS Limited | 2 | 2 | 2 February 2012 | 29 June 2026 |
| TalkTalk Communications Limited | 2 | 2 | 19 January 2012 | 19 January 2012 |
| (AQ) LIMITED | 1 | 1 | 12 September 2012 | 12 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 10 April 2012 | 10 April 2012 |
| AQL Wholesale Ltd | 1 | 1 | 4 August 2006 | 4 August 2006 |
| Adepteo Limited | 1 | 1 | 6 December 2016 | 6 December 2016 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 27 March 2009 | 27 March 2009 |
| Atomstream Limited | 1 | 1 | 14 May 2010 | 14 May 2010 |
| BT | 1 | 1 | 15 July 1994 | 15 July 1994 |
| Barritel Limited | 1 | 1 | 27 June 2007 | 27 June 2007 |
| Belgacom International Carrier Services SA | 1 | 1 | 6 February 2020 | 6 February 2020 |
| Bicom Systems EURL | 1 | 1 | 1 March 2012 | 1 March 2012 |
| Bink Networks Ltd | 1 | 1 | 3 April 2023 | 3 April 2023 |
| CFL Communications Ltd | 1 | 1 | 14 July 2009 | 14 July 2009 |
| Colt Technology Services | 1 | 1 | 18 July 2016 | 18 July 2016 |
| Content Guru Limited | 1 | 1 | 12 October 2012 | 12 October 2012 |
| Convergence Group (wireless) Networks Limited | 1 | 1 | 21 May 2019 | 21 May 2019 |
| Core Telecom Limited | 1 | 1 | 5 August 2010 | 5 August 2010 |
| DIDWW Ireland Limited | 1 | 1 | 22 January 2019 | 22 January 2019 |
| Dial 9 Communications Limited | 1 | 1 | 8 January 2020 | 8 January 2020 |
| Digitech Solutions Global Limited | 1 | 1 | 28 April 2010 | 28 April 2010 |
| EVE CONNECT LTD | 1 | 1 | 9 November 2022 | 9 November 2022 |
| Flextel Limited | 1 | 1 | 11 November 2005 | 11 November 2005 |
| GCI Network Solutions Limited | 1 | 1 | 20 December 2023 | 20 December 2023 |
| Gamma Telecom Holdings Limited | 1 | 1 | 25 April 2005 | 25 April 2005 |
| Hello Telecom (UK) Limited | 1 | 1 | 20 July 2012 | 20 July 2012 |
| I.T Communications Limited | 1 | 1 | 5 September 2019 | 5 September 2019 |
Showing the 30 largest of 77 holders.
All number blocks on 01720first 200 of 523, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 172000 | Protected | — |
| +44 172001 | Protected | — |
| +44 172002 | Protected | — |
| +44 172003 | Protected | — |
| +44 172004 | Protected | — |
| +44 172005 | Protected | — |
| +44 172006 | Protected | — |
| +44 172007 | Protected | — |
| +44 172008 | Protected | — |
| +44 172009 | Protected | — |
| +44 172010 | Protected | — |
| +44 172011 | Protected | — |
| +44 172012 | Protected | — |
| +44 172013 | Protected | — |
| +44 172014 | Protected | — |
| +44 172015 | Protected | — |
| +44 172016 | Protected | — |
| +44 172017 | Protected | — |
| +44 172018 | Protected | — |
| +44 172019 | Protected | — |
| +44 172020 | Protected | — |
| +44 172021 | Allocated | VoIP-Un Limited |
| +44 172022 | Allocated | Redcentric Solutions Limited |
| +44 172023 | Allocated | Telecom2 Limited |
| +44 172024 | Allocated | Digital Space Group Limited |
| +44 172025 | Allocated | Nodemax Limited |
| +44 172026 | Allocated | Nationwide Telephone Assistance Ltd |
| +44 172027 | Allocated | (AQ) LIMITED |
| +44 1720280 | Protected | — |
| +44 1720281 | Protected | — |
| +44 1720282 | Protected | — |
| +44 1720283 | Protected | — |
| +44 1720284 | Protected | — |
| +44 1720285 | Protected | — |
| +44 1720286 | Protected | — |
| +44 1720287 | Protected | — |
| +44 1720288 | Allocated | TalkTalk Communications Limited |
| +44 1720289 | Allocated | TalkTalk Communications Limited |
| +44 172029 | Allocated | Voiceflex Limited |
| +44 172030 | Allocated | AQL Wholesale Ltd |
| +44 1720310 | Protected | — |
| +44 1720311 | Protected | — |
| +44 1720312 | Protected | — |
| +44 1720313 | Protected | — |
| +44 1720314 | Protected | — |
| +44 1720315 | Protected | — |
| +44 1720316 | Protected | — |
| +44 1720317 | Protected | — |
| +44 1720318 | Protected | — |
| +44 1720319 | Protected | — |
| +44 1720320 | Allocated | YayYay Limited |
| +44 1720321 | Allocated | Orbtalk Limited |
| +44 1720322 | Allocated | Convergence Group (wireless) Networks Limited |
| +44 1720323 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1720324 | Protected | — |
| +44 1720325 | Allocated | Internexus Networks Limited |
| +44 1720326 | Allocated | Simwood eSMS Limited |
| +44 1720327 | Protected | — |
| +44 1720328 | Allocated | Bicom Systems EURL |
| +44 1720329 | Allocated | ICC Networks Ltd |
| +44 172033 | Protected | — |
| +44 1720340 | Protected | — |
| +44 1720341 | Protected | — |
| +44 1720342 | Protected | — |
| +44 1720343 | Protected | — |
| +44 1720344 | Protected | — |
| +44 1720345 | Protected | — |
| +44 1720346 | Protected | — |
| +44 1720347 | Protected | — |
| +44 1720348 | Protected | — |
| +44 1720349 | Protected | — |
| +44 172035 | Allocated | TelNG Limited |
| +44 172036 | Allocated | Localphone Limited |
| +44 1720370 | Protected | — |
| +44 1720371 | Protected | — |
| +44 1720372 | Protected | — |
| +44 1720373 | Protected | — |
| +44 1720374 | Protected | — |
| +44 1720375 | Protected | — |
| +44 1720376 | Protected | — |
| +44 1720377 | Allocated | Spitfire Network Services Limited |
| +44 1720378 | Protected | — |
| +44 1720379 | Protected | — |
| +44 172038 | Allocated | Barritel Limited |
| +44 1720390 | Protected | — |
| +44 1720391 | Protected | — |
| +44 1720392 | Protected | — |
| +44 1720393 | Protected | — |
| +44 1720394 | Protected | — |
| +44 1720395 | Protected | — |
| +44 1720396 | Protected | — |
| +44 1720397 | Protected | — |
| +44 1720398 | Protected | — |
| +44 1720399 | Protected | — |
| +44 172040 | Protected | — |
| +44 172041 | Allocated | Gamma Telecom Holdings Limited |
| +44 172042 | Allocated | BT |
| +44 1720430 | Allocated | Linear Telecoms Limited |
| +44 1720431 | Allocated | 8x8 Communications UK Limited |
| +44 1720432 | Allocated | Hello Telecom (UK) Limited |
| +44 1720433 | Allocated | Ziron Limited |
| +44 1720434 | Protected | — |
| +44 1720435 | Allocated | Invoco Ltd |
| +44 1720436 | Allocated | Content Guru Limited |
| +44 1720437 | Allocated | IOVOX Limited |
| +44 1720438 | Allocated | Minotaur Telecom Limited |
| +44 1720439 | Allocated | XoverX Ltd |
| +44 172044 | Protected | — |
| +44 172045 | Allocated | Magrathea Telecommunications Limited |
| +44 172046 | Protected | — |
| +44 172047 | Allocated | TTNC Limited |
| +44 172048 | Allocated | Flextel Limited |
| +44 172049 | Allocated | Net-Work Internet Ltd |
| +44 1720500 | Allocated | Voxbone SA |
| +44 1720501 | Protected | — |
| +44 1720502 | Protected | — |
| +44 1720503 | Protected | — |
| +44 1720504 | Protected | — |
| +44 1720505 | Protected | — |
| +44 1720506 | Protected | — |
| +44 1720507 | Protected | — |
| +44 1720508 | Protected | — |
| +44 1720509 | Protected | — |
| +44 172051 | Allocated | Served Up Limited |
| +44 172052 | Protected | — |
| +44 172053 | Allocated | Solutios Limited |
| +44 1720540 | Protected | — |
| +44 1720541 | Protected | — |
| +44 1720542 | Protected | — |
| +44 1720543 | Protected | — |
| +44 1720544 | Protected | — |
| +44 1720545 | Protected | — |
| +44 1720546 | Protected | — |
| +44 1720547 | Allocated | Digital Space Group Limited |
| +44 1720548 | Protected | — |
| +44 1720549 | Protected | — |
| +44 172055 | Allocated | Simwood eSMS Limited |
| +44 172056 | Allocated | Mars Communications Limited |
| +44 172057 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 172058 | Allocated | Nexus Telecommunications Limited |
| +44 172059 | Allocated | Telecoms World Limited |
| +44 172060 | Allocated | CFL Communications Ltd |
| +44 1720610 | Allocated | Digitech Solutions Global Limited |
| +44 1720611 | Allocated | Suretec Systems Ltd |
| +44 1720612 | Allocated | Atomstream Limited |
| +44 1720613 | Protected | — |
| +44 1720614 | Protected | — |
| +44 1720615 | Allocated | Core Telecom Limited |
| +44 1720616 | Allocated | GCI Network Solutions Limited |
| +44 1720617 | Allocated | Windsor Telecom Limited |
| +44 1720618 | Allocated | Telephone Box Limited |
| +44 1720619 | Protected | — |
| +44 1720620 | Allocated | Phone Co-Op Numbering Limited |
| +44 1720621 | Protected | — |
| +44 1720622 | Allocated | Invosys Limited |
| +44 1720623 | Allocated | Nexbridge Communications Limited |
| +44 1720624 | Allocated | Colt Technology Services |
| +44 1720625 | Allocated | Adepteo Limited |
| +44 1720626 | Allocated | Nuso Cloud UK Limited |
| +44 1720627 | Allocated | Fuse 2 Communications Ltd |
| +44 1720628 | Allocated | Fuse 2 Communications Ltd |
| +44 1720629 | Allocated | EVE CONNECT LTD |
| +44 1720630 | Protected | — |
| +44 1720631 | Allocated | IP Voice Networks Ltd |
| +44 1720632 | Allocated | Kalnet4U Ltd |
| +44 1720633 | Allocated | Redwood Technologies Ltd |
| +44 1720634 | Allocated | Zapappi Ltd |
| +44 1720635 | Allocated | Sky UK Limited |
| +44 1720636 | Allocated | Number Services Ltd. |
| +44 1720637 | Allocated | DIDWW Ireland Limited |
| +44 1720638 | Allocated | Vodafone Ltd (C&W) |
| +44 1720639 | Protected | — |
| +44 1720640 | Protected | — |
| +44 1720641 | Protected | — |
| +44 1720642 | Protected | — |
| +44 1720643 | Protected | — |
| +44 1720644 | Protected | — |
| +44 1720645 | Protected | — |
| +44 1720646 | Protected | — |
| +44 1720647 | Protected | — |
| +44 1720648 | Protected | — |
| +44 1720649 | Protected | — |
| +44 1720650 | Protected | — |
| +44 1720651 | Protected | — |
| +44 1720652 | Protected | — |
| +44 1720653 | Protected | — |
| +44 1720654 | Protected | — |
| +44 1720655 | Protected | — |
| +44 1720656 | Protected | — |
| +44 1720657 | Protected | — |
| +44 1720658 | Protected | — |
| +44 1720659 | Protected | — |
| +44 1720660 | Protected | — |
| +44 1720661 | Protected | — |
| +44 1720662 | Protected | — |
| +44 1720663 | Protected | — |
| +44 1720664 | Protected | — |
| +44 1720665 | Protected | — |
| +44 1720666 | Protected | — |
| +44 1720667 | Protected | — |
Related lookups
- 01736 Penzance60 km away
- 01209 Redruth85 km away
- 01326 Falmouth92 km away
- 01872 Truro98 km away
- Digital Space Group Limited2 allocated blocks on 01720
- Fuse 2 Communications Ltd2 allocated blocks on 01720
- Simwood eSMS Limited2 allocated blocks on 01720
- All UK towns A–ZDialling codes by town
- More Cornwall 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 01720
Where is area code 01720?
01720 is Ofcom's Isles of Scilly numbering area, in Cornwall, South West England. Its exchange town is in Isles of Scilly. From abroad, drop the 0 and dial +44 1720.
Do I need to dial 01720 for a local call?
Traditionally not from another 01720 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01720 first always works, and mobiles always need it.
How are 01720 numbers written?
Numbers on 01720 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01720 234 567. From abroad the leading zero is dropped: +44 1720 then the local number.
What was the 01720 area code before?
01720 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 0720. Old signage or stationery showing 0720 refers to the same Isles of Scilly numbers.
Which phone companies hold 01720 numbers?
Ofcom lists 77 providers with allocated blocks on 01720. The largest are Digital Space Group Limited with 2 of the 81 allocated blocks, Fuse 2 Communications Ltd with 2 of the 81 allocated blocks and Simwood eSMS Limited with 2 of the 81 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 01720?
By distance between exchange towns, the nearest other codes are 01736 Penzance (60 km), 01209 Redruth (85 km), 01326 Falmouth (92 km) and 01872 Truro (98 km).
How do I report a scam call from a 01720 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.