UK area code
01436 area code — Helensburgh
01436 is Ofcom’s Helensburgh numbering area, in Argyll and Bute, Scotland. 88 phone companies hold its 106 allocated number blocks. Its numbers are written like 01436 234 567. The nearest other codes are 01475 Greenock (6 km) and 01389 Dumbarton (12 km).
01436 at a glance
- Ofcom area name
- Helensburgh
- Council area
- Argyll and Bute
- Country
- Scotland
- Number format
- 01436 234 567 (4+6)
- Local calls
- Full number recommended
- Current code since
- 1995 (previously 0436)
- Allocated blocks
- 106 of 388 (27%) across 88 providers
- Newest block
- 26 January 2026 (1 in the last 12 months)
Sources: Ofcom numbering data (weekly) and area-code list, Ofcom Numbering Plan, ONS geography.
If a 01436 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 Police Scotland on 101. In Scotland fraud goes to Police Scotland rather than Report Fraud.
01436 history and number format
Number format: Numbers on 01436 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01436 234 567.
Before 1995: 01436 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 0436.
Local dialling: Traditionally not from another 01436 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01436 first always works, and mobiles always need it.
Allocation record: the oldest number block still visible on 01436 was allocated on 15 July 1994, and the most recent on 26 January 2026. 1 block was allocated in the last 12 months — newly-activated ranges with no call history, which is worth knowing when an unfamiliar 01436 number rings (see the weekly numbering changelog for every new allocation.)
Phone companies holding 01436 numbers
Every Ofcom range holder with blocks on 01436, 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 | 9 | 9 | 15 July 1994 | 15 July 2005 |
| Inet Telecoms Ltd (Voipfone) | 3 | 3 | 30 November 2009 | 30 November 2009 |
| TalkTalk Communications Limited | 3 | 3 | 19 January 2012 | 13 February 2013 |
| Digital Space Group Limited | 2 | 2 | 30 November 2007 | 15 March 2016 |
| Fuse 2 Communications Ltd | 2 | 2 | 4 July 2017 | 22 January 2024 |
| GCI Network Solutions Limited | 2 | 2 | 25 April 2017 | 20 December 2023 |
| Gamma Telecom Holdings Limited | 2 | 2 | 28 April 2005 | 22 September 2021 |
| Sky UK Limited | 2 | 2 | 2 July 2013 | 4 December 2015 |
| Vodafone Ltd (C&W) | 2 | 2 | 2 September 2013 | 10 November 2021 |
| (AQ) LIMITED | 1 | 1 | 11 September 2012 | 11 September 2012 |
| 24 Seven Cloud Communications Ltd | 1 | 1 | 17 January 2020 | 17 January 2020 |
| 8x8 Communications UK Limited | 1 | 1 | 29 March 2012 | 29 March 2012 |
| AQL Wholesale Ltd | 1 | 1 | 26 June 2006 | 26 June 2006 |
| Adepteo Limited | 1 | 1 | 17 January 2017 | 17 January 2017 |
| Alnitak GmbH | 1 | 1 | 7 July 2017 | 7 July 2017 |
| Andrews & Arnold (Numbers) Ltd | 1 | 1 | 6 March 2009 | 6 March 2009 |
| Atomstream Limited | 1 | 1 | 23 April 2010 | 23 April 2010 |
| Barritel Limited | 1 | 1 | 7 June 2007 | 7 June 2007 |
| Bicom Systems EURL | 1 | 1 | 2 March 2012 | 2 March 2012 |
| Bink Networks Ltd | 1 | 1 | 3 April 2023 | 3 April 2023 |
| CFL Communications Ltd | 1 | 1 | 10 July 2009 | 10 July 2009 |
| Calltracks Limited | 1 | 1 | 20 September 2013 | 20 September 2013 |
| Colt Technology Services | 1 | 1 | 13 July 2016 | 13 July 2016 |
| Content Guru Limited | 1 | 1 | 15 October 2012 | 15 October 2012 |
| DIDWW Ireland Limited | 1 | 1 | 27 January 2020 | 27 January 2020 |
| DRD Communications Limited | 1 | 1 | 3 November 2023 | 3 November 2023 |
| Datazero Ltd | 1 | 1 | 29 April 2019 | 29 April 2019 |
| Dial 9 Communications Limited | 1 | 1 | 10 December 2019 | 10 December 2019 |
| Digitech Solutions Global Limited | 1 | 1 | 28 April 2010 | 28 April 2010 |
| EVE CONNECT LTD | 1 | 1 | 15 June 2022 | 15 June 2022 |
Showing the 30 largest of 88 holders.
All number blocks on 01436first 200 of 388, by prefix
| Prefix | Status | Range holder |
|---|---|---|
| +44 143600 | Protected | — |
| +44 143601 | Protected | — |
| +44 143602 | Protected | — |
| +44 143603 | Protected | — |
| +44 143604 | Protected | — |
| +44 143605 | Protected | — |
| +44 143606 | Protected | — |
| +44 143607 | Protected | — |
| +44 143608 | Protected | — |
| +44 143609 | Protected | — |
| +44 143610 | Protected | — |
| +44 143611 | Protected | — |
| +44 143612 | Protected | — |
| +44 143613 | Protected | — |
| +44 143614 | Protected | — |
| +44 143615 | Protected | — |
| +44 143616 | Protected | — |
| +44 143617 | Protected | — |
| +44 143618 | Protected | — |
| +44 143619 | Protected | — |
| +44 143620 | Allocated | TelNG Limited |
| +44 143621 | Allocated | Localphone Limited |
| +44 143622 | Protected | — |
| +44 143623 | Allocated | Barritel Limited |
| +44 143624 | Protected | — |
| +44 143625 | Allocated | Voiceflex Limited |
| +44 1436260 | Protected | — |
| +44 1436261 | Protected | — |
| +44 1436262 | Protected | — |
| +44 1436263 | Protected | — |
| +44 1436264 | Protected | — |
| +44 1436265 | Protected | — |
| +44 1436266 | Protected | — |
| +44 1436267 | Protected | — |
| +44 1436268 | Allocated | TalkTalk Communications Limited |
| +44 1436269 | Allocated | TalkTalk Communications Limited |
| +44 143627 | Allocated | (AQ) LIMITED |
| +44 143628 | Allocated | VoIP-Un Limited |
| +44 143629 | Allocated | Digital Space Group Limited |
| +44 143630 | Allocated | Telecom2 Limited |
| +44 143631 | Allocated | Nodemax Limited |
| +44 143632 | Allocated | Pulsant (Scotland) Limited |
| +44 143633 | Allocated | Net-Work Internet Ltd |
| +44 143634 | Protected | — |
| +44 1436350 | Allocated | Voxbone SA |
| +44 1436351 | Protected | — |
| +44 1436352 | Protected | — |
| +44 1436353 | Protected | — |
| +44 1436354 | Protected | — |
| +44 1436355 | Protected | — |
| +44 1436356 | Protected | — |
| +44 1436357 | Protected | — |
| +44 1436358 | Protected | — |
| +44 1436359 | Protected | — |
| +44 143636 | Allocated | Solutios Limited |
| +44 1436370 | Protected | — |
| +44 1436371 | Protected | — |
| +44 1436372 | Protected | — |
| +44 1436373 | Protected | — |
| +44 1436374 | Protected | — |
| +44 1436375 | Protected | — |
| +44 1436376 | Protected | — |
| +44 1436377 | Allocated | Digital Space Group Limited |
| +44 1436378 | Protected | — |
| +44 1436379 | Protected | — |
| +44 143638 | Quarantined | — |
| +44 143639 | Allocated | Mars Communications Limited |
| +44 1436400 | Allocated | YayYay Limited |
| +44 1436401 | Protected | — |
| +44 1436402 | Allocated | Invoco Ltd |
| +44 1436403 | Allocated | Internexus Networks Limited |
| +44 1436404 | Protected | — |
| +44 1436405 | Allocated | Bicom Systems EURL |
| +44 1436406 | Allocated | Simwood eSMS Limited |
| +44 1436407 | Allocated | 8x8 Communications UK Limited |
| +44 1436408 | Allocated | ICC Networks Ltd |
| +44 1436409 | Allocated | Orbtalk Limited |
| +44 143641 | Protected | — |
| +44 1436420 | Protected | — |
| +44 1436421 | Allocated | Phone Co-Op Numbering Limited |
| +44 1436422 | Allocated | Invosys Limited |
| +44 1436423 | Allocated | Sky UK Limited |
| +44 1436424 | Allocated | Nexbridge Communications Limited |
| +44 1436425 | Protected | — |
| +44 1436426 | Allocated | INTELLIGENT EXCHANGES LIMITED |
| +44 1436427 | Allocated | TalkTalk Communications Limited |
| +44 1436428 | Allocated | IOVOX Limited |
| +44 1436429 | Allocated | Ziron Limited |
| +44 143643 | Allocated | Vodafone Ltd (C&W) |
| +44 143644 | Allocated | Served Up Limited |
| +44 143645 | Allocated | AQL Wholesale Ltd |
| +44 143646 | Allocated | TTNC Limited |
| +44 1436470 | Protected | — |
| +44 1436471 | Protected | — |
| +44 1436472 | Protected | — |
| +44 1436473 | Protected | — |
| +44 1436474 | Protected | — |
| +44 1436475 | Protected | — |
| +44 1436476 | Protected | — |
| +44 1436477 | Allocated | Spitfire Network Services Limited |
| +44 1436478 | Protected | — |
| +44 1436479 | Protected | — |
| +44 1436480 | Protected | — |
| +44 1436481 | Protected | — |
| +44 1436482 | Protected | — |
| +44 1436483 | Protected | — |
| +44 1436484 | Protected | — |
| +44 1436485 | Protected | — |
| +44 1436486 | Protected | — |
| +44 1436487 | Protected | — |
| +44 1436488 | Protected | — |
| +44 1436489 | Protected | — |
| +44 143649 | Allocated | Redcentric Solutions Limited |
| +44 143650 | Allocated | Andrews & Arnold (Numbers) Ltd |
| +44 143651 | Allocated | Telecoms World Limited |
| +44 143652 | Allocated | Nexus Telecommunications Limited |
| +44 143653 | Allocated | Invade International Ltd |
| +44 143654 | Quarantined | — |
| +44 143655 | Allocated | CFL Communications Ltd |
| +44 143656 | Protected | — |
| +44 1436570 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1436571 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1436572 | Protected | — |
| +44 1436573 | Protected | — |
| +44 1436574 | Protected | — |
| +44 1436575 | Protected | — |
| +44 1436576 | Protected | — |
| +44 1436577 | Allocated | Inet Telecoms Ltd (Voipfone) |
| +44 1436578 | Protected | — |
| +44 1436579 | Protected | — |
| +44 1436580 | Allocated | Digitech Solutions Global Limited |
| +44 1436581 | Allocated | Calltracks Limited |
| +44 1436582 | Allocated | Telephone Box Limited |
| +44 1436583 | Protected | — |
| +44 1436584 | Allocated | GCI Network Solutions Limited |
| +44 1436585 | Allocated | Suretec Systems Ltd |
| +44 1436586 | Allocated | Windsor Telecom Limited |
| +44 1436587 | Allocated | Telappliant Limited |
| +44 1436588 | Allocated | Atomstream Limited |
| +44 1436589 | Allocated | VoiceHost Limited |
| +44 1436590 | Allocated | Content Guru Limited |
| +44 1436591 | Allocated | Nuso Cloud UK Limited |
| +44 1436592 | Allocated | Hello Telecom (UK) Limited |
| +44 1436593 | Allocated | Kalnet4U Ltd |
| +44 1436594 | Allocated | Redwood Technologies Ltd |
| +44 1436595 | Allocated | Minotaur Telecom Limited |
| +44 1436596 | Allocated | Fuse 2 Communications Ltd |
| +44 1436597 | Allocated | M247 Ltd |
| +44 1436598 | Allocated | XoverX Ltd |
| +44 1436599 | Allocated | Datazero Ltd |
| +44 143660 | Protected | — |
| +44 1436610 | Allocated | Linear Telecoms Limited |
| +44 1436611 | Allocated | Number Services Ltd. |
| +44 1436612 | Allocated | Zapappi Ltd |
| +44 1436613 | Allocated | Alnitak GmbH |
| +44 1436614 | Allocated | 24 Seven Cloud Communications Ltd |
| +44 1436615 | Allocated | Dial 9 Communications Limited |
| +44 1436616 | Allocated | Adepteo Limited |
| +44 1436617 | Allocated | SiPalto Ltd |
| +44 1436618 | Allocated | EVE CONNECT LTD |
| +44 1436619 | Allocated | ICUK Computing Services Limited |
| +44 143662 | Allocated | Flextel Limited |
| +44 143663 | Allocated | BT |
| +44 143664 | Allocated | Gamma Telecom Holdings Limited |
| +44 143665 | Allocated | BT |
| +44 143666 | Allocated | GCI Network Solutions Limited |
| +44 143667 | Allocated | BT |
| +44 1436680 | Allocated | DRD Communications Limited |
| +44 1436681 | Protected | — |
| +44 1436682 | Protected | — |
| +44 1436683 | Protected | — |
| +44 1436684 | Protected | — |
| +44 1436685 | Protected | — |
| +44 1436686 | Protected | — |
| +44 1436687 | Protected | — |
| +44 1436688 | Protected | — |
| +44 1436689 | Protected | — |
| +44 1436690 | Protected | — |
| +44 1436691 | Protected | — |
| +44 1436692 | Protected | — |
| +44 1436693 | Protected | — |
| +44 1436694 | Protected | — |
| +44 1436695 | Protected | — |
| +44 1436696 | Protected | — |
| +44 1436697 | Protected | — |
| +44 1436698 | Protected | — |
| +44 1436699 | Protected | — |
| +44 1436700 | Protected | — |
| +44 1436701 | Allocated | Sky UK Limited |
| +44 1436702 | Protected | — |
| +44 1436703 | Allocated | DIDWW Ireland Limited |
| +44 1436704 | Allocated | Colt Technology Services |
| +44 1436705 | Allocated | Resilient Limited |
| +44 1436706 | Allocated | I.T Communications Limited |
| +44 1436707 | Protected | — |
| +44 1436708 | Allocated | IP Voice Networks Ltd |
| +44 1436709 | Allocated | Fuse 2 Communications Ltd |
| +44 1436710 | Allocated | Media Hawk Ltd |
| +44 1436711 | Allocated | KCOM Group Ltd |
| +44 1436712 | Allocated | Virgin Media Limited |
Related lookups
- 01475 Greenock6 km away
- 01389 Dumbarton12 km away
- 01369 Dunoon13 km away
- 01301 Arrochar21 km away
- BT9 allocated blocks on 01436
- Inet Telecoms Ltd (Voipfone)3 allocated blocks on 01436
- TalkTalk Communications Limited3 allocated blocks on 01436
- All UK towns A–ZDialling codes by town
- More Scotland 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 01436
Where is area code 01436?
01436 is Ofcom's Helensburgh numbering area, in Argyll and Bute, Scotland. Its exchange town is in Argyll and Bute. From abroad, drop the 0 and dial +44 1436.
Do I need to dial 01436 for a local call?
Traditionally not from another 01436 landline, but it now depends on your provider: Ofcom stopped requiring providers to offer local (code-free) dialling on 11 March 2022. Dialling 01436 first always works, and mobiles always need it.
How are 01436 numbers written?
Numbers on 01436 use Ofcom's 4+6 format: the 5-digit code (including the leading 0) followed by a 6-digit local number — written like 01436 234 567. From abroad the leading zero is dropped: +44 1436 then the local number.
What was the 01436 area code before?
01436 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 0436. Old signage or stationery showing 0436 refers to the same Helensburgh numbers.
Which phone companies hold 01436 numbers?
Ofcom lists 88 providers with allocated blocks on 01436. The largest are BT with 9 of the 106 allocated blocks, Inet Telecoms Ltd (Voipfone) with 3 of the 106 allocated blocks and TalkTalk Communications Limited with 3 of the 106 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 01436?
By distance between exchange towns, the nearest other codes are 01475 Greenock (6 km), 01389 Dumbarton (12 km), 01369 Dunoon (13 km) and 01301 Arrochar (21 km).
How do I report a scam call from a 01436 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 Police Scotland on 101. Unwanted sales calls go to the ICO after registering with the Telephone Preference Service.