Configuring FON as a wireless client (WEP network)
Configuring FON to connect to a WEP secured wireless network as a client is pretty much the same as configuring it to join a WPA network (see in trackbacks)
Follow only Step 2 of that entry and we just need to change the settings used for /etc/config/wireless The config would look like:
config wifi-device wifi0
option type atheros
config wifi-iface
option device wifi0
option mode sta
option ssid <SSID>
option encryption wep
option key <wep key>
Ensure that all your settings are done right before rebooting. Else you might lock yourself out of the router due to misconfigured network interfaces.