WFC stands for **WiiConnect24** — a Wii system feature that kept the console connected to the internet while in standby mode (orange light).
**Discontinued.** Nintendo shut down the WiiConnect24 service (along with most Wii online) on **June 28, 2013** (Japan) / **May 20, 2014** (elsewhere). The feature no longer functions.
Modern Wii homebrew (Priiloader, RiiConnect24) can restore *some* functionality (Wii Mail, News/Weather channels, limited DLC) via community servers.