not sure if this has affected anyone else. I have a Gevey SIM so it is possible it only effects those users. I was just in Ireland for the weekend, and noticed I was getting charged 10p for texts all the time at random... I wasn't sending any texts and had all data turned off. Well after 2 days I finally figured out that iMessage is trying to "Authenticate with Apple"at times (maybe when I step in and out of WiFi zones and using iMessage at those times) and it must try to send a "text" every time. This same setting is for FaceTime too so I can't be sure if it is only iMessage. But yeah this is just a warning in case anyone else runs into the same situation... don't be stuck without any credit!