Hey Hey!
Just found this whilst browsing through Vodafone's (Ireland) price plans. Well now I don't suppose FR would be in a rush to make this known to all their passengers
>>>copied from Vodafone Ireland website >>>
Some airlines, including Ryanair, are now making it possible for passengers to use their mobiles during flights. However, all in-flight mobile phone calls require a satellite link up, which results in very high costs for customers, over and above our normal charges for roaming across Europe. In order to determine customer demand for the service and to protect customers from the possibility of higher-than-expected charges, Vodafone Ireland have decided not to make this service available to our customers at this time.