Nintendo has made some places as Nintendo hotspots. To find the Nintendo hotspots, visit nintendowifi.com and locate the hotspot nearest you.

If you are already at the nintendo hotspot, do the following steps to finally connect to the network:

1. Insert your Nintendo WFC compatible game into your Nintendo
   DS and turn on the power.
2. On the Nintendo DS Menu Screen, select the game title in the DS
   Game Selection panel.
3. From the game menu options, select the choice for Nintendo
   WFC game play modes. The name of this choice may vary from
   game to game.
4. From the Nintendo WFC menu, select the choice to connect to
   the Nintendo WFC service. The name of this choice may vary
   from game to game.

Source:  nintendo.com

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