BT customers can now take advantage of 7.5 million wireless broadband hotspots around the world.
The broadband provider - which offers free and unlimited access to Wi-Fi hotspots for BT subscribers - is continuing to expand its network.
Some 4.5 million of the hotspots - more than half - are to be found in the UK.
BT has more than 65,000 in Birmingham and Leeds, around 72,000 in Manchester, Edinburgh and Sheffield, and more than 59,000 in Liverpool, Brighton, Bristol and Cardiff.
The firm also has more than 500,000 Wi-Fi hotspots in Greater London, which were used by millions of visitors during the London 2012 Olympic and Paralympic Games.
Wireless broadband users can now take advantage of a new BT Wi-Fi access app, making it easy to find a hotspot in the UK and log in from a Windows Mobile device.
The new BT Wi-Fi app is the fourth to launch - following the success of iOS, Android and BlackBerry apps.
Combined, these have now passed over two million downloads by BT broadband customers.
Andy Baker, Chief Executive of BT Wi-Fi, said his firm's mission is to make it easy to find and use BT Wi-Fi at its 4.5 million hotspots in the UK.
"The new Windows Mobile app completes our stable of apps, making it really easy to find a hotspot out and about, no matter what type of device you are using," he stated.