Re: A general problem
And how do you do that when the manufacturers are located in countries that simply don't care?
Put the manufacturers on a banned list should they fail to honour their legal responsibilities. That threat would certainly keep the big guys like Apple and Samsung and Sony in line. There would doubtless still be "grey" (or outright black) imports of dodgy mobiles from companies you'd never heard of, but at least you'd have the option of buying a trusted brand and getting better.
The strange thing is how little the big brands seem to care about this issue. When the general public decide that there's really no advantage at all in buying a big brand over buying "cheap and cheerful", because the hardware is no longer sufficiently distinguishable and the software is all equally crap, then the cheapest will be the best. For similar reasons the "free" phone on an expensive 24-month contrick is another doomed business model.