Free WiFi from Vodafone.. Need a Vodafone number ...

Free WiFi from Vodafone.. Need a Vodafone number to get the code... Last time when I travelled that is about one month ago I have searched for a free WiFi then got it from Vodafone.., but the problem is the code..
Just keep one Vodafone number or connect it at the entrance of Airport to get the code and stay connected to enjoy the free WiFi from Vodafone