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Teenagers across the UK may argue it's not oxygen, but rather the other O2 that sustains their lives. Telefónica O2 UK -- a branding choice intended to reflect the essential nature of the company's products -- puts mobile phones and wireless services in the hands of more than 22 million individual and business customers in the UK. The company also provides broadband services to about 800,000 subscribers. The company is a primary operating subsidiary of cell phone giant Telefónica O2 Europe, which serves nearly 60 million customers in five countries. In 2016 regulators denied a proposed purchase of Telefonica O2 UK by Hutchison.