Its magic, I tell you. I purchased an iphone 4s in the Netherlands from Vodafone. They allow you to use it for 60 days a year outside of the netherlands in other EU countries. Last week I visited Paris and the phone worked fine and texting too, but every time I tried to use maps or email or any other data app it wouldnt work. I would get an error that said "could not activate cellular data network" "PDP authentication failed." (I attached a screen shot) I returned today and went to the Vodafone shop and they had no idea what was going on. They had me call their customer service line where the gentleman said that not only was it working, but that I used 150MB of data while I was there. It must be magic. Because it wouldnt work when I attempted to use it, but it works for them to bill me. Has anyone experienced anything similar? Are their apps that let you monitor other apps data usage? Am i crazy for believing in magic?