I'm lucky (?) to live somewhere where 2G isn't going to be turned off any time soon, due to legacy support requirements. Otherwise, I'd have to get one of Nokia's newer "dumb smartphone" devices.
I would have kept my previous phones for a lot longer if it wasn't for them switching of the 2G network, and next year they switch of the 3G network! (Australia for reference)
These 4G dumb phones are cool but the power requirements of 4G can be a burden once you actually start making calls. So you get weird things like 30 days stand by but 3 hours talk time