i am currently in australia. I removed my sim card before I landed. I have been using my phone to connect to wifi. I have just noticed that my phone is showing approx 350mb data has been used while the SIM card has been removed. I am obviously concerned. Previously using wifi has never shown as data usage on my phone. i was under the impression that if the SIM was removed that I would be safe from incurring any roaming fees, or any other charges.