I was just wondering because many software titles for 3DS (Mii Plaza, 3DS Sound, Super Smash Bros. etc.) have Streetpass support, and the only way of achieving Streetpass is to walk put one's 3DS into Sleep Mode and walk next to somebody who also has a 3DS in Sleep Mode. Sadly, that would only work in advanced and well-populated countries (Japan, China, USA, Australia, Canada and so on).