for Android or Apple, walkingonthemoon ?
I put a few suggestions for Android games (for a 6yo boy) on a thread where someone using Apple wanted to find a way to get apps to a friend's Android mobile for her son.
Not sure if identical apps were available for the iPhone but I first suggested a couple of car related games and then an aeroplane game, and the MNetter with Apple certainly tried one of the games :)
None of them were "educational" really, I'm sorry, but just a bit of (free) fun as it meant the friend with the Android phone could have had them without any concern over cost...