Yes, you can. You can also turn off wireless if needed.
There is no 'airplane mode' for the 3DS. Basically, turning off wireless on the 3DS will be the 'airplane mode' equivalent.
Yes no metter what 3DS is a 3DS
you cant use the 3DS charger for the DS/DS Lite, but you can use the 3DS charger for the DSi and the same with the DSi charger, you can use it for the 3DS.
Yes, you can. Wireless can also be turned off if needed.
You'd have to use system transfer to migrate your ID from the 3DS to the 3DS XL before you can access your downloaded games on it.
No. A DSI cant use a 3DS charger.
No, the 3DS will not recognise it.
Yes , use LunaPic In your 3Ds .
no
No,it will not block your 3DS,if you use R4 3DS card is real flashcard.
Yes, you can. However, since the Nintendo 3DS are region locked, the European 3DS will not be able to play North American 3DS games.
3DS games do not have friend codes, it is the friend code of the 3DS itself that you use, to be able to play multiplayer on a 3DS game.
No, you can play regular DS games on a 3DS too.