BT is offering a free FON app for Apple iPhone and Android users that are BT Total Broadband customers, that will allow them to use anyone of the 1.6 million Wi-Fi hotspots that are part of BT's nationwide network.
Users' smartphones will automatically (and seamlessly) connect to the hotspots and the app - which will show users where the hotspots are - will receive weekly updates.
Most of the Wi-Fi hotspots are made up of residential and business broadband customers that have agreed to share their broadband line in exchange for the ability to use the BT FON network.
John Peter, the managing director of BT Retail business, said that "This free app makes accessing Wi-Fi so simple you don't even have to think about it. This represents real value to our customers at a time when more and more people are using their mobile phone to access the internet."
In addition, BT says that they will give 50p for every app download to BBC's Children in Need Appeal for the first 20,000 downloads. Interestingly, there's no limit to the amount of data that one can download from the wireless hotspots.
You can lean more about BT FON and the FON community here.