This chain of retail stores is now operated by Telefonica Europe. The brand specialises in mobile phones, and there are over 450 stores across the UK.
O2 stores essentially come in two different formats - franchise and retail. Retail outlets are owned and maintained by O2 UK, rather than private investors.
Most of the O2 stores have a resident O2 Guru - a technical specialist.
The stores sell a wide range of mobile phone handsets and contract options, as well as providing advice on phone and broadband deals.
The stores are often found on the high street, and are an extension of the wider brand and its website offering.