BT Openzone is a Wi-Fi hotspot service provided by BT Group. BT operates around 4,000 wireless stations in the UK, located in public locations such as cafés, hotels, pubs, stations and airports; BT's network accounts for 40% of the UK's wifi hotspot population. Premises with BT's business hub (an ADSL broadband router aimed at small business premises) can opt to enable BT Openzone functionality on their equipment (allowing roaming Openzone customers to connect via a firewalled network). BT has also adapted some of its population of public phone boxes to include an Openzone hotspot.

Access can be gained through "pre-paid vouchers" purchasable over the counter at the hotspot locations, or via BT's website. Members of the BT FON community can obtain access to BT FON, BT Openzone and FON hotspots only, but not via a roaming partner, free of charge after joining the scheme. BT also has deals with large UK mobile phone companies O2, Vodafone, and Orange to provide internet access for their subscribers, particularly to those with smart phones. In Germany there is a free Openzone hotspot in nearly every Starbucks.