Three UK
| Company type | Subsidiary |
|---|---|
| Industry | Telecommunications |
| Founded | March 3, 2003 |
| Headquarters | Reading , England, United Kingdom |
Area served | United Kingdom |
Key people | Robert Finnegan (CEO) |
| Products | 3G, 4G, 5G mobile telecommunications services; MVNO host; SMARTY brand |
| Owner | VodafoneThree (joint venture of Vodafone 51%, CK Hutchison Holdings 49%) |
| Parent | VodafoneThree |
Hutchison 3G UK Limited, operating under the brand name Three UK, is a telecommunications firm based in Reading, England. It functions as a fully owned subsidiary of VodafoneThree, a joint venture formed by Vodafone holding 51% and CK Hutchison Holdings owning 49%. Among the four principal mobile network providers in the United Kingdom, it ranks as the smallest, serving around 10.9 million users , behind its VodafoneThree counterpart, Vodafone UK.
Established on 3 March 2003 as the UK's inaugural fully commercial 100% 3G network, Three UK delivers 3G, 4G, and 5G connectivity through its proprietary infrastructure. In June 2023, a proposed merger with Vodafone UK was announced, which received clearance from the Competition and Markets Authority in December 2024 and was finalized in June 2025.
History
The Three mobile network commenced operations in the UK on 3 March 2003, launching the nation’s first commercial 3G service. It was the pioneer in complying with the regulatory mandate to cover 80% of the population by December 2004.
At launch, Three introduced its first retail outlets, known as 3Store, located in London and Birmingham, subsequently expanding into major shopping centres throughout the UK by 2005. In October 2006, Three significantly broadened its retail presence by acquiring 95 high street stores previously operated by O2 and The Link.
Three introduced SeeMeTV, a platform enabling users to upload video content and earn revenue through micropayments, sharing profits with creators once their earnings exceeded £10.
In 2010, Three became the fourth mobile operator in the UK to offer the iPhone 4. By July 2014, it launched the 3 inTouch application allowing voice calls over Wi-Fi and granted access to Virgin’s Wi-Fi network across more than 130 London Underground stations.
On 24 March 2015, Hutchison Whampoa, Three’s parent company, revealed intentions to acquire rival O2 UK for £10.25 billion; however, this transaction was blocked by the EU in May 2016 due to antitrust concerns.
In November 2016, Three experienced a security breach impacting roughly nine million customers, where attackers exploited authorized login credentials to steal approximately 400 devices.
In early 2020, after nine years at the helm, CEO Dave Dyson resigned; Robert Finnegan, who was CEO of Three Ireland at that time, assumed leadership of both entities.
Beginning with the 2020–21 season, Three became the primary shirt sponsor for Premier League football club Chelsea. Nevertheless, on 10 March 2022, Three terminated its sponsorship agreement and requested removal of its branding from Chelsea’s jerseys.
Network
To comply with UK coverage regulations initially, Three maintained a national roaming arrangement with an existing 2G provider. This service was supplied by O2 until May 2006 when Orange took over as the national roaming partner.
During the early phase of its 3G deployment, Orange’s 2G network (later acquired by EE in 2010) acted as a fallback option where Three’s own 3G signal was absent. Starting in 2010, Three began phasing out this fallback support for older devices limited to 2G connectivity. By 2013, substantial reliance on fallback coverage had been eliminated across most regions of the UK.
In December 2007, a joint venture named Mobile Broadband Network Limited (MBNL) was established between T-Mobile and Three on an equal ownership basis to combine their respective 3G networks and achieve near-complete population coverage by late 2008. By November 2010, MBNL managed approximately twelve thousand shared sites.
In 2022, Three declared intentions to discontinue its 3G network by the end of 2024. Research conducted in October that year indicated that this shutdown enhanced data speeds but led to decreased coverage in certain locations.
4G
In December 2013, Three initiated a limited launch of 4G LTE services in select cities including London, Birmingham, Manchester, and Reading, expanding coverage to over 450 locations by the close of 2014. Permission to utilize a portion of the 1,800 MHz spectrum from EE's 4G network was granted to Three in August 2012. Subsequently, in February 2013, Ofcom allocated 10 MHz of the 800 MHz band to Three for its 4G deployment. Although the initial plan targeted a Q2 2013 launch, Three postponed the rollout until Q4 to analyze competitors' network reach.
Under its "Ultrafast" brand, the operator provides LTE and DC-HSDPA technologies as standard offerings, promoting itself as the UK's sole unlimited 4G provider at a highly competitive price. In April 2015, Three revealed intentions to implement VoLTE services alongside the use of the 800 MHz spectrum starting from September.
Network upgrades
In November 2018, Three UK declared a £2 billion investment aimed at facilitating its 5G network expansion. This initiative encompassed acquiring spectrum through the purchase of Relish Broadband, securing 40MHz across the 3.4GHz, 3.6GHz, and 3.9GHz frequency bands. The upgrade programme also involved constructing a dark fibre infrastructure linking 20 new data centres and rolling out carrier aggregation technology across approximately 2,500 sites to improve existing 4G network capabilities.
Roaming at domestic prices
Prior to 2009, Three customers in countries such as the UK, Ireland, Austria, Italy, Denmark, Sweden, Hong Kong, and Australia benefited from "3 Like Home," which allowed roaming without additional charges. The service was reintroduced in August 2013 under the name "Feel At Home," enabling UK subscribers to roam without extra fees in multiple countries including Australia, Austria, Denmark, Hong Kong, Ireland, Italy, and Sweden. By 2016, this offering expanded further to cover Finland, France, Indonesia, Israel, Macau, New Zealand, Norway, Spain, Sri Lanka, Switzerland, the US, plus an additional 24 European nations.
Renamed "Go Roam" in 2017, the service extended its reach to encompass 59 countries and territories—marketed as "71 destinations" by counting certain regions separately (for example, Ireland and Republic of Ireland). The "Go Roam" benefit applies exclusively to roaming usage and does not cover international calls originating from the UK.
In September 2021, Three UK updated its contract terms for new customers: "Go Roam" is no longer complimentary. Instead, it requires a daily fee of £2 for roaming within the EU (excluding Ireland) and £5 per day for roaming outside EU countries.
Frequency allocations
| Frequency | Band | Protocol | Class |
|---|---|---|---|
| 2,100 MHz | B1 n1 |
UMTS/HSDPA/HSPA+/LTE/LTE Advanced 5G NR |
3G/4G/4G+ 5G |
| 1,800 MHz | B3 | LTE/LTE Advanced | 4G/4G+ |
| 800 MHz | B20 | LTE/LTE Advanced | 4G/4G+ |
| 700 MHz | B28 n28 |
LTE/LTE Advanced 5G NR |
4G/4G+ 5G |
| 1,500 MHz | B32 | LTE Advanced | 4G+ |
| 3,700 MHz | n77 | 5G NR | 5G (unused) |
| 3,500 MHz | n78 | 5G NR | 5G |
Virtual operators
The Three network accommodates a variety of mobile virtual network operators (MVNOs).
In May 2015, Currys plc introduced the iD Mobile service.
By August 2017, Three UK had launched its own brand, SMARTY.
In June 2018, Three UK partnered with its affiliate Superdrug to establish the Superdrug Mobile network.
Merger with Vodafone
In 2015, Three UK proposed a £10.2 billion merger with O2 UK, which would have consolidated the UK's mobile networks from four to three. This transaction involved Telefonica selling O2 to CK Hutchison Holdings, the parent company of Three UK; however, the European Commission blocked the merger due to concerns over market competition.
Fast forward to 2023, Vodafone UK agreed to merge with Three UK, pending regulatory approval. The unified company would serve approximately 27 million customers, making it the largest mobile operator in the UK and surpassing O2's 24 million and EE's 20 million subscribers. Vodafone Group would hold a majority 51% share, while CK Hutchison would retain 49%. The consumer organization Which? voiced apprehensions regarding potential price hikes and diminished service quality.
In March 2024, the Competition and Markets Authority (CMA) launched an in-depth review due to competition-related issues. By December 2024, the CMA approved the merger under conditions that include an £11 billion investment pledge in 5G infrastructure, price caps on tariffs, and a requirement to uphold fixed contract terms for MVNOs for three years. Oversight of compliance will be conducted by both CMA and Ofcom. The agreement also grants Vodafone an option to acquire Hutchison's stake after three years, which Vodafone is anticipated to exercise.
The merger was finalized in June 2025, accompanied by plans to invest £11 billion into UK network infrastructure over the coming decade.
SMARTY
Three unveiled SMARTY in August 2017 as a straightforward SIM-only offering aimed at competing with O2's giffgaff and Vodafone's VOXI brands. Unlike Three’s traditional service that includes phone support, SMARTY delivers customer assistance solely through live chat, community forums, and online help resources; its live chat is managed by Three UK’s support team.
SMARTY operates on a flexible 30-day rolling contract enabling customers to cancel at any time. It includes complimentary EU roaming and MMS messaging and does not require credit checks, making it attractive to individuals with lower credit ratings. However, SMARTY does not currently support eSIM functionality.
Between 2019 and 2024, SMARTY earned several accolades from comparison site uSwitch for Best PAYG Network and Best Value SIM Only, solidifying its reputation as a cost-effective mobile provider.
Awards
In 2010, Three was named Best Network for Mobile Broadband in a YouGov survey for the second year running.
At the uSwitch Broadband and Mobile Awards, Three received honors such as Best Network for Roaming and Most Popular Mobile Network in 2018; Best Network for Roaming in 2019; and again both Best Network for Roaming and Most Popular Mobile Network in 2020.
From 2021 through 2024, Three claimed four out of six biannual Speedtest Awards recognizing the Fastest 5G Mobile Network.
In 2021 alone, Three garnered multiple uSwitch awards including Best Network for Data, Best Network for Roaming, Best SIM Only Network, and Most Popular Mobile Network.
Most recently, in 2023, Three was acknowledged as Best Network for Business at the Mobile Industry Awards.