This! Low-end Nokia phones are not meant to replace Android phones, but as a backup(supplementary) phone.
Might not be apparent in Silicon valley but in third-world countries its:
* Snatcher deterrence. It would be less likely targeted than say an iPhone when used in risky public areas.
* Ideal for people who'd only use a phone for texting and calling (eg. older people, farmers, laborers).
* A phone that does not need baby sitting: long batt life, doesn't care if it falls on the floor, when it rains just wrap it in plastic.
* And the one thing that I miss the most in smartphones: Texting without ever looking at the screen.