Smartphone update policies getting longer, which is good for your wallet and the planet
(All About Windows Phone)

When it comes to the number of years software support claimed for a given mainstream smartphone, we naturally - and rightly - think of that as a security comfort blanket. In other words, OS security issues discovered during that period will get fixed and we`ll be protected, however far we stray from the beaten track in the web browser or whatever malicious content is fired at us while mobile. But there are extra benefits from long support times. By pushing out the need for a new phone*, we can save (quite a lot) money. And, topically in these climate crisis times, we can all help save the environment.