> Make sure that your device has Location Services turned on for Wi-Fi networking, because regulations in each country or region define the Wi-Fi channels and wireless signal strength allowed there.

That one surprised me.

I'd have expected that there would be a field in the data broadcast from the router that identified what country's or region's regulations it is operating under, and that client devices designed to handle multiple multiple countries or regions would use that to select channels and power levels that are legal there.