Don’t Connect Your iPhone to This Wifi Network - Gizmodo

Do not connect to this network unless you want your phone’s wifi functionality to break.

Schou explained that after he joined network “%p%s%s%s%s%n”, his iPhone permanently disabled its wifi functionality.

Doing this resets all saved wifi networks on your iPhone, consequently erasing the cursed network name from the device’s memory.

While you don’t find wifi networks named “%p%s%s%s%s%n” every day, it’s best to be vigilant about any network with a percent sign or in the same vein as this one until Apple fixes the issue in an update.