Yes, the little blue switch controls whether the WiFi is on/off. Keep it off unless you need it activated. Mine is always off. Unfortunately work has a Cisco control on it's access points to keep people from snooping.

I do wonder if it is truly off b/c I get that icon on the top; but if I tap it, a msg comes up asking me to turn it on, so I guess it's not. How much time are others getting with regular use - no WiFi?