Hi Guys
Your in luck I work in the mobile industry just now!
If you are crew and travelling may I suggest a sim4travel
www.sim4travel.com this is some countries does not charge you when your recieve a call think most of europe is covered by this and I am pretty sure if someone calls you it comes off there mins as a uk call.
Although Vodafone do the vodafone passport you pay 75p for the connection then you can talk for a hour for that 75p but only in countries that have a vodafone network and you need to be using that for example in Italy you would roam onto Omnitel Vodafone in spain Vodafone ES.
Hope this helps
Ps I dont work for any of these companies...