With a valid credit card
We saw the reveal of the New 3DS this morning. It looks pretty sweet right? I already upgraded from a standard launch 3DS to an XL, and now I want to do it all over again. It also has a pretty unique feature from an internet standpoint -- it will lock out a lot of sites unless you verify your identity.
Yep, in Japan, you'll need to manually turn off a filter meant to block many websites by paying a nominal $0.30 fee with a valid credit card -- something parents can limit with parental controls. This is essentially a way to prevent children looking at mature content.
Given the problems Nintendo has had with things like Swap Note in the past, this makes sense.
New 3DS 'Filters' The Internet In Japan [Kotaku]