It's not possible using attributes, but some columns are saved automatically. For example Devices table state is saved if you have cookies enabled.
There is problem with selecting columns in iPhone or android that's why I'm asking.
Anton, is any way to edit "Reports" columns manually (I mean - config file, database table)?
What is the right way to change default columns which are displayed in Devices and Reports? Is it possible to save it per user (eg. using attributes)?