Yes
No, the 3DS is region locked.
No, all 3DS consoles are region locked.
No, the 3DS is region locked.
Keep in mind the following - 3DS games are region locked, either Japanese, EU + Australia, and US/CAN versions. This region is the only important factor, not your geographical location. You can use a US 3DS in the UK just fine with a UK charger, but, you will have to import US 3DS games as EU ones will not play on it. You can purchase digital games from the US eShop, but you must buy $US wallet top-up cards, these are currency and country locked so again a £UK one will not work.
No. The 3DS is region locked, EU games will not work on a US 3DS.
The DSi XL is not region locked, it will play games from any region. The exception is for games marked as 'DSi-enhanced' such as Pokemon Conquest. These work in a regular DS or 3DS, but not a DSi from the wrong region.
Basically the 3DS XL is a larger 3DS so if you want a larger screen size, go for the 3DS XL. The 3DS is cheaper and is smaller if the XL is too bulky for you.
No, It's for both 3DS and 3DS XL. 3DS XL is just a larger version of the 3DS.
I think it's the Nintendo 3DS XL.
No, 3DS games are region locked.
Of course. The 3DS XL is just bigger. It can still play normal DS and 3DS games.
It can play European DS games, but not European 3DS games. 3DS games are region locked, but you can still play regular DS games on any 3DS console (tested with European 3DS and US DS games).