Im studying abroad in London and im from the US. I know if I were to use my phone I would get charged heavily but there are exceptions. My phone has been in Airplane mode since I left the country and I've been using Wi-Fi for my Internet needs. But I didn't turn the data off...I didn't even realize I could. I was told by friends that Airplane mode is enough if I'm just using Wi-Fi for Internet browsing. Will there be charges?