For those looking for a good Android app that uses OSM. I use Mapfactor Navigator and think it is great (I've used it in Italy, Austria, Slovenia, Crozia). It let's you use it with OSM data or Tom Tom, you can use Google for address search and use it offline if you need.
I'm not affiliated, just a happy user
https://play.google.com/store/apps/details?id=com.mapfactor....