A question for anyone who has BT Mobile.

When you use a BT WiFi access point on your phone, do you have to manually authenticate through a web page or does the BT WiFi access point use SIM authentication so you seamlessly connect to any nearby access point?

Just install the BT-WiFi app, follow setup instructions.
You will have to login to the first WiFi hotspot then it will automatically login thereafter when in range providing you have auto-join enabled.

The app on my Android tablet connects automatically but I have to manually fire up the app on my Windows phone to get it to connect (using the stored login details provided first time).