R4 card is used to play games by downloading from internet. you can download as much games and put it in r4 card depending on the size of R4 card(2gb, 4gb etc).u can even listen songs on it.(u can see it on YouTube that how to put songs on R4 card).u can store pics in it(use youtube for it).u can theme ur r4 card(youtube)u can watch movies and clips on r4 card(youtube) hope u enjoy. i hope i helped.
BY; Saad Ashraf (saad 2 sid) thnX
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These are the main disadvantages to the R4: * There will be no more updates; The official R4 team disappeared. * As a result, the R4 isn't being produced much, supply is running out. * The R4 does not support SDHC MicroSD cards (it supports up to 2GB)
R4 cards are legal until you download non-homebrew NDS roms They're illegal to sell in New zealand, but u can still use them
The R4 cards don't excist anymore, Nintendo banned them from around the world. the R4's you can find now are fake and have even more chance to wreck your DS(i).
parklea markets and online =D =) EDIT: Google R4 Mania - just keep in mind that it's illegal in the UK and the Netherlands
This is not a simple answer... let me explain: If you have updated your DSi to version 4.0 then you CANNOT because this update will have blocked cards such as R4 etc. If you HAVE NOT updated your DSi to version 4.0 then there are two explanations. The R4 card will not work because they only work on NDS/NDSLs. However, you can use cards built for DSi like the AceCard and the DSTTI card.