Andrea for this you can contact Private Support 💬. Your cards (also Apple/Google Pay) you can block via https://bunq.app. Wire transfers require your hand scan, as Roeshimi said, so transferring large sums is basically impossible. Then, you can configure low daily limits for the accounts you have your savings on, then the app will require additional authentication sooner. Your phone you should also secure properly yourself of course, set up a strong code, and keep it close whenever possible. Obviously there is always a chance of losing your phone/get it stolen. From your explanation I fail to see what you would like to see implemented; just a toggle in the app to block accounts? When you have access to the app, why not simply change login codes etc..? That seems simpler to me? Or did you mean something else?