Three UK

Three UK (Hutchison 3G UK Limited, Reading, England) is a United Kingdom mobile network operator that launched in 2003 as the country's first 3G-only carrier and grew into a consumer and business mobile, 5G, and home broadband provider, also operating the SMARTY sub-brand. Since 31 May 2025 Three UK has been a wholly owned subsidiary of VodafoneThree, the merged Vodafone UK / Three UK joint venture that is 51% Vodafone Group and 49% CK Hutchison Holdings, serving roughly 27 million UK customers. In the telecom value chain Three UK is a network owner and access provider, not a developer platform: it sells connectivity, spectrum-backed coverage, wholesale and MVNO capacity, and business connectivity, while its group-level enterprise, IoT, private-network and wholesale propositions are marketed through CK Hutchison's CKH IOD and Three Group Solutions. Its API posture is partner-gated and sales-led. Three UK publishes no public developer portal, no self-serve signup, no downloadable OpenAPI, no SDKs, and no public Postman workspace; every candidate developer hostname (developer, developers, docs, apis, sandbox, opengateway) resolves only to a wildcard Akamai record whose certificate does not cover it, and the Wayback Machine holds no snapshot of a Three UK developer portal ever existing. Three UK is nonetheless a real participant in the sector's standards layer: it is named in the CAMARA Project's governance participants list, its parent CK Hutchison Holdings is listed as an Operator in the CAMARA landscape, and on 23 September 2025 CK Hutchison Group Telecom (Three) commercially launched CAMARA KYC Age Verification and KYC Tenure network APIs alongside BT/EE, Virgin Media O2, and Vodafone under GSMA Open Gateway, on top of an already-available SIM Swap API, with KYC Match committed. Those APIs are reachable only through channel partners and aggregators — JT Group and TMT.ID are named as processing UK operator network API traffic, and Three UK's majority owner Vodafone Group is a founding venture partner in Aduna — never through a Three UK developer surface.

Three UK is profiled on the APIs.io network. Tagged areas include Telecommunications, United Kingdom, Mobile Network Operator, Network APIs, and CAMARA.

Three UK’s developer surface includes engineering blog, support, pricing, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub
19.0/100 emerging ▬ flat Agent 4/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs
TelecommunicationsUnited KingdomMobile Network OperatorNetwork APIsCAMARAGSMA Open Gateway5GBroadbandRoamingSIM SwapIdentity VerificationAge VerificationWholesaleMVNOPartner Gated

Kin Score

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scored 2026-07-27 · rubric v0.5
Composite quality — 19.0/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 1.3 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 2.1 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 4/100 · human only
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 0 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/three-uk: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Three Uk Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Login
Login

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

WellKnown
WellKnown
 LLMsTxt
LLMsTxt

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 Lifecycle
Lifecycle

Build 1

SDKs, sample code, and the tooling you integrate with

Packages
Packages

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 3

Status, limits, changes, and where to get help

StatusPage
StatusPage
 Support
Support
 PressRelease
PressRelease

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Pricing
Pricing

Company 6

The organization behind the API

Website
Website
 BusinessWebsite
BusinessWebsite
 Blog
Blog
 GroupWebsite
GroupWebsite
 ParentWebsite
ParentWebsite
 LinkedIn
LinkedIn

Other 3

Properties that don't map to a standard resource type

Standards
Standards
 Standards
Standards
 Standards
Standards

Source (apis.yml)

apis.yml Raw ↑ 
aid: three-uk
url: https://raw.githubusercontent.com/api-evangelist/three-uk/refs/heads/main/apis.yml
name: Three UK
kind: company
description: 'Three UK (Hutchison 3G UK Limited, Reading, England) is a United Kingdom mobile network operator that launched
  in 2003 as the country''s first 3G-only carrier and grew into a consumer and business mobile, 5G, and home broadband provider,
  also operating the SMARTY sub-brand. Since 31 May 2025 Three UK has been a wholly owned subsidiary of VodafoneThree, the
  merged Vodafone UK / Three UK joint venture that is 51% Vodafone Group and 49% CK Hutchison Holdings, serving roughly 27
  million UK customers. In the telecom value chain Three UK is a network owner and access provider, not a developer platform:
  it sells connectivity, spectrum-backed coverage, wholesale and MVNO capacity, and business connectivity, while its group-level
  enterprise, IoT, private-network and wholesale propositions are marketed through CK Hutchison''s CKH IOD and Three Group
  Solutions. Its API posture is partner-gated and sales-led. Three UK publishes no public developer portal, no self-serve
  signup, no downloadable OpenAPI, no SDKs, and no public Postman workspace; every candidate developer hostname (developer,
  developers, docs, apis, sandbox, opengateway) resolves only to a wildcard Akamai record whose certificate does not cover
  it, and the Wayback Machine holds no snapshot of a Three UK developer portal ever existing. Three UK is nonetheless a real
  participant in the sector''s standards layer: it is named in the CAMARA Project''s governance participants list, its parent
  CK Hutchison Holdings is listed as an Operator in the CAMARA landscape, and on 23 September 2025 CK Hutchison Group Telecom
  (Three) commercially launched CAMARA KYC Age Verification and KYC Tenure network APIs alongside BT/EE, Virgin Media O2,
  and Vodafone under GSMA Open Gateway, on top of an already-available SIM Swap API, with KYC Match committed. Those APIs
  are reachable only through channel partners and aggregators — JT Group and TMT.ID are named as processing UK operator network
  API traffic, and Three UK''s majority owner Vodafone Group is a founding venture partner in Aduna — never through a Three
  UK developer surface.'
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
tags:
- Telecommunications
- United Kingdom
- Mobile Network Operator
- Network APIs
- CAMARA
- GSMA Open Gateway
- 5G
- Broadband
- Roaming
- SIM Swap
- Identity Verification
- Age Verification
- Wholesale
- MVNO
- Partner Gated
created: '2026-07-25'
modified: '2026-07-25'
specificationVersion: '0.19'
apis: []
common:
- type: DomainSecurity
  url: security/three-uk-domain-security.yml
- type: WellKnown
  name: Well-known discovery probe index
  url: well-known/three-uk-well-known.yml
- type: Conformance
  name: CAMARA / GSMA Open Gateway conformance posture
  url: conformance/three-uk-conformance.yml
- type: Lifecycle
  name: Network service lifecycle
  url: lifecycle/three-uk-lifecycle.yml
- type: StatusPage
  name: Network status - affected areas
  url: https://www.three.co.uk/support/network-and-coverage/affected-areas
- type: Packages
  name: Client library search (no first-party SDKs)
  url: packages/three-uk-packages.yml
- type: LLMsTxt
  name: llms.txt
  url: llms/three-uk-llms.txt
- type: Website
  url: https://www.three.co.uk/
- type: BusinessWebsite
  url: https://www.three.co.uk/business
- type: Blog
  url: https://www.three.co.uk/blog
- type: Support
  url: https://www.three.co.uk/support
- type: GroupWebsite
  url: https://groupsolutions.three.com/
- type: ParentWebsite
  url: https://ckhiod.com/
- type: Login
  name: My3 account
  url: https://www.three.co.uk/account
- type: TermsOfService
  url: https://www.three.co.uk/terms-conditions
- type: PrivacyPolicy
  name: Three's privacy portal
  url: https://www.three.co.uk/privacy-safety/about-privacy
- type: Pricing
  name: Latest price guides
  url: https://www.three.co.uk/terms-conditions/price-guides/latest-price-guides
- type: LinkedIn
  url: https://www.linkedin.com/company/three-uk
- type: Standards
  url: https://github.com/camaraproject/Governance/blob/main/PARTICIPANTS.MD
- type: Standards
  url: https://camaraproject.org/
- type: Standards
  url: https://www.gsma.com/solutions-and-impact/gsma-open-gateway/
- type: PressRelease
  url: https://www.gsma.com/newsroom/press-release/uk-mobile-operators-launch-age-verification-and-anti-fraud-apis-through-gsma-open-gateway-initiative/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com