@skye have you heard of KaiOS? it's based on FirefoxOS and got pretty popular in India. But it's made it's way to the global market as well.
You can find it in Nokia handhelds:
https://www.nokia.com/phones/en_us/nokia-6300-4g?sku=16LIOW11A01
keep in mind, it's not android. I would assume there's some kind of openstreetmap based app on there. But I don't know.
If you prefer android, there is the BlackBerry Key2 but honestly at this point I don't know who/what owns blackberry....