Yeah, of course you can, but when you update ur PSP use a US updater
Yes, they are not region encoded.
No, while PSP games are region free, the UMD movies are not. A UK UMD movie will not play on a US PSP.
Yes it should.
i do know that you can play iso's of any region on a us psp slim. if that helps any http://www.myspace.com/yaboyface
Only UMD movies are region locked. UMD games are not region locked, so that would work fine.
it will work regardless of where you bring it - it just may not be able to connect to their networks...
PSP consoles and games have regions, but the games are not region locked, you can play a game from the US on a console from the UK, for example. Movies however are region locked and can only be played on a PSP from the same region.
It will work in the Us as there is nothing to stop it from working however you can't run foreign games without a freeloader (confuses psp to think its a us, jpn, etc. allowing foreign games to run)of some sort
PAL and NTSC usually refer to analogue television formats. Since the PSP has its own proprietary screen, PAL and NTSC in this case refers to the region the PSP comes from, which is important for the purposes of UMD movies and some online services. That means a US PSP can play a game from the UK, the video format is exactly the same. But UMD movies are region restricted so a US PSP can only play US UMD movies.
Yes, PSP games are not region locked, though PSP movies are.
No. Unless you have a UK to US power adaptor you can not use it.
It probably wouldn't be either. US PSPs are region code 1, UK ones are region code 3. The rest of Europe has its own PSP region code, 4. So one from Portugal will simply be a 'European' PSP which in this context is different from a British one.