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Reference.org
O2 (UK)
open-in-new
<p>Telefonica UK Limited, <a href="/facts/Trading_as/0tbWP1Sn">trading as</a> O2 (stylised as O2), is a British <a href="/facts/List_of_telephone_operating_companies/w3XNSPkq">telecommunications services provider</a>, headquartered in <a href="/facts/Reading%2c_Berkshire/QH9uGAJY">Reading</a>, England which operates under the <a href="/facts/O2_(brand)/6xQDu6AT">O2 brand</a>. It is owned by <a href="/facts/Virgin_Media_O2/gc4Juj8v">VMED O2 UK Limited</a>, a 50:50 joint venture between <a href="/facts/Telef%25C3%25B3nica/9oQKlCw8">Telefónica</a> and <a href="/facts/Liberty_Global/7TWLwTmT">Liberty Global</a>. O2 is the UK's <a href="/facts/List_of_mobile_network_operators_of_Europe/NzFqIbPy">largest mobile network operator</a>, with about 23.2 million subscribers as of December 2024. </p>