No, you can't.
No. The Nintendo DSi and the Nintendo 3DS store games on the SD card, not a sim card.
No no, currently, all R4 3DS card run DSi model on 3DS console. There is no flashcard which can run 3D games. So the R4 3DS card is actually DSi card.
No, you can't.
No, dsi games work in a 3ds, wont appear 3d though, but the dsi does not have the ability to play 3ds games.
The TTDS can't work on the 3DS console. But there is a new TT 3DS card, which can run DSi games perfectly on Nintendo 3DS console.
The 3ds supports all DS, DSI, and 3DS games. Like the DSI, it no longer supports game-paks for the Game Boy Advance.
No. 3DS games are not compatible with the DSi XL.
The 3DS transfer tool allows you to transfer DSI games from a DSi to a 3DS.
If you download a 3DS game or DSi Ware (not DLC) from the Nintendo eShop, the game will appear on the home menu for the 3DS XL.
All r4 3ds cards can directly support dsi console. No need to do anything. Just insert the r4 3ds card into the dsi console, it can be read.
No, 3DS games can only be played on the 3DS.
That is not possible. You can transfer DSiWare games from DSi to 3DS, but not the other way around.