The British Airways app lets you access your current and upcoming flight details, check-in and discover flight information, timetables and so on. Right now you can only use the mobile boarding pass between London Heathrow and Edinburgh. I m sure this will be gradually opened to other routes in due time.
It makes so much sense to have it on your mobile as its always with you and there is no need to ransack your bag or pocket anymore for that flimsy boarding pass. As a traveler myself, i Love it.