If my phone is lost or stolen, can anyone log in to the app using an image of my fingerprint?

You should let us know so we can suspend your mobile banking app.

Mobile banking app helpdesk
0345 366 0012 (overseas +44 2381 244 177)
Open Monday to Saturday 8am - 6pm.
Calls may be recorded.

Call charge information.

You also need to tell your mobile phone network provider immediately so they can disable the service to your phone. If you have the 'Find my iPhone' enabled then you can remotely wipe your iPhone via iCloud.