BT Openzone is a Wi-Fi hotspot service provided by BT Group. BT Openzone is accessible at more than 4,000,000 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.