.

Also know, is PSP region free?

Yes, PSP games are region free, but UMD movies aren't.

Also Know, can a Japanese PSP play American Games? Japanese PSP will play US games but the games will not release until March 2005 and so nothing can be confirmed until then. Japanese PSP can set the English Language option in the config settings but most of the Japanese games will probably not have English language option in the game.

Then, is the PSP Go region locked?

yes, all games are region free. if you got some umd movies from another region, you can change your region in the recovery menu anyway.

Is the PS Vita region locked?

According to Sony, the PlayStation Vita's game cards have no region lock. You should be able put US game cards into your Japanese system (or Japanese cards into a UK system, or HK cards into a US system) and everything should work just fine.