When you say Nokia basically doesn't exist as a consumer handset brand in the developed market, how do you quantify existence? Argos currently sells 23 Nokia phones. https://www.argos.co.uk/browse/technology/mobile-phones-and-accessories/sim-free-phones/c:30147/brands:nokia/ That's a lot less than the number of Samsung and Apple phones, but still enough to make Nokia the fourth highest in the filter-by-brand list which is sorted by number of phones from that brand. There are of course myriad places to buy a phone other than Argos, but Argos is a prominent high street retailer in a developed market.
There was an interesting documentary about Nokia on BBC Four a year or so ago https://www.bbc.co.uk/programmes/b0b9kj80 at time of writing it's not available on iPlayer but easily located for those inclined.