...or you could just open Safari or Mail on your iPhone and it will tell you for certain not only what Wi-Fi is available, but which are locked for security which the other devices won't do. Keychain devices have a bad habbit of picking up WiFi that has no SSID broadcast so even if it claims there's a clear signal, dragging out the notebook usually results in finding out you can't log on anyway.
Most people with a notebook and a need to use WiFi in multiple places typically have PDAs or smartphones anyway, so who do these keychain devices really target anyway? They're just an accessory for retailers to push on people buying a new laptop, or on a kid starting college...