I'm so happy Mario Kart Wii is still active. The fact that I have no issue find 12 people rooms almost 7 years after the servers were shut down is so amazing. :
Wiimmfi/Connection Status - Custom Mario Kart
Wiimmfi status codes meaning | GBAtemp.net - The Independent Video Game Community
How to play Nintendo DS Wiimmfi without a hotspot | Page 2 | GBAtemp.net - The Independent Video Game Community
Cannot set/assign new Wiimmfi friend code for some wii games | GBAtemp.net - The Independent Video Game Community