This has inspired me.
I may buy an old older android phone and integrate it somehow into the car in a more permanent fashion for GPS, music, Wifi, OBDII Bluetooth reader, etc
I've always liked the iPad install, but it's too big for my taste. It's also a huge target for thieves.
I think a small phone would be perfect and I'm thinking about integrating it into one of the visors, maybe? We will see.
I kind of like the rear view mirror idea with built in Android, GPS, Bluetooth, Wifi, backup cam, etc. I'm just concerned about weight and looks.