Wi-Fi access will be available across the US.
http://www.nintendoworldreport.com/news/25555
Following a system update in late May, over 10,000 AT&T Wi-Fi hotspots will be accessible to Nintendo 3DS owners nationwide across the US.
Players will be able to access Wi-Fi features for SpotPass content delivery and eShop connectivity in restaurants, book stores, airports, and more.