To get Nintendo DS wifi you need to either have a wireless internet connection,have the Nintendo DS WiFi USB thingy attached to a PC with internet acesss, or be at a Wifi hotspot. So really, it all depends on how much the place sponsoring the hotspot requires, or how much your internet costs. So in a way, its free, but not totally. I hope i wasn't too confusing @_@ !
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Yes, it connects to other Nintendo DS's, the Nintendo Wii, and to the internet with it.
There is a wi-fi USB internet adapter available for the Nintendo DS.
,mnjhn
Use WI-FI, first U have to connect UR DS to the Internet.
All versions of the Nintendo DS use wi-fi to connect to other DS's in range. As with most other wi-fi devices, the range is around up to 50 meters, but it can work further depending on interference and if anything is in the way.