Originally Posted by
OPebble
Depends whether your laptop uses a dongle or not. Vodafone have a USB dongle that covers both wifi and 3G etc. This definitely shouts louder. Also a number of PC manufacturers are now building in the dongle so you don't have a USB sized stick poking out the side just waiting to get broken off!

If turning on your wifi also turns on a mobile signal, you have a problem, whether or not the aircraft provides a wifi service.