As an Android user, is it possible to modify my phone to use this service instead of Google's? Is it possible to upload the database directly to a phone or replace an APK to achieve this?
Hanno from Mozilla here. Marvin reached out to us about a month back and we have been slow to respond. He just got an email back a week ago. So I think this is still going to happen, but no concrete timeline yet.
Then try using a geolocation service like Google Maps or http://html5demos.com/geo . If it can't find your location, check Mozilla's zoomable coverage map to see if your neighborhood is covered: https://location.services.mozilla.com/map . If not, please consider installing Mozilla Stumbler to help map it. :)