Yes, from experience i have played games on my PSP from China and Europe. The only differences between releases are (generally): art, language and rating system.
No, not all UMD movies are region free but some are region free.
No, while PSP games are region free, the UMD movies are not. A UK UMD movie will not play on a US PSP.
Yes, European PSP games will work on a US PSP, and vice versa. The games are region free, but the UMD movies are not.
The PSP is region locked only for UMD movies being played on the machine. all games are region free and will work from anywhere in the world
Only UMD movies are region locked. UMD games are not region locked, so that would work fine.
If you mean PSP games on UMD, no, the PSP Go does not have a slot for UMD.
You mean UMD's Yea? Well you go to games on the psp menu then click on UMD
Games aren't region-locked on the PSP, so you just insert the UMD as normal and play.
The games will work, yes. PSP games are not region locked, but UMD movies are.
All PSPs are region locked, but the UMD games themselves are not region specific. You can therefore play any PSP game on any PSP (barring the PSP Go which is different), however UMD movies are region locked just like DVDs.
You should have no problem with games as all PSP games are region free, the only problem is with UMD Movies which are region coded. To put it simply any game will work anywhere.
No, the UMD movies are region-locked. You could only play a Region 1 movie UMD in the USA, for example. The games will work fine on any region though. Obviously an American PSP will not stop playing Region 1 movies if you take the console into another country.