Nokia Mobile released the update for its MyPhone app that brings the possibility to purchase insurance in 20 European countries.
If you go to Support and then click on Warranty and insurance, you can select the insurance plan for your Nokia device. I did try that, but the option is currently not working for me, or not working in Spain.
Anyway, the update also brings some bug fixes and performance improvements, although I can see that the back button integrated into the app is not working in some parts.
Download the app from Google Play.