lol one that was never supposed to run android, you can actually find out by looking through the backups, but I'll ruin the surprise anyway:

an n900 with a triple boot, I installed android on it for this specific purpose, it actually runs so well now I might actually start using it more often. Unfortunately, I've had to reflash the android partition about 3 times now for a few of these backups(in order to use different accounts and settings you can only change once to my knowledge).