BT is introducing a new mobile application which automatically connects customers to its network of 1.6 million Wi-Fi hotspots.

Launched this week, the free iPhone and Android application gives BT Total Broadband subscribers ready mobile access to free and unlimited Wi-Fi.

Included with the application is a mapping service - updated weekly – which enables users to find their nearest hotspot.

After downloading the app, all BT customers need to do is input their email username and password, and choose to be automatically logged in to their account.

"The access is unlimited and free for BT Total Broadband customers, so there's no chance of racking up extra costs on your mobile phone bill," the broadband provider claimed.

Meanwhile, BT is giving 50p to BBC Children in Need for every free BT FON application downloaded, up to a target of £10,000.