I'm so confused. Got an iPhone 5 for Christmas and am on my husbands account. Recently got a huge bill for downloading data and realised I should have had cellular data switched off so only home wifi was being used. Inadvertently used data outdoors assuming was connecting to wi FI networks in area so this could account for high bill. However, since then another large bill has come in even with cellular data off. Is it possible iPhone 5 could be downloading data through phone network rather than wifi even when cellular data switched off? I am thinking of just getting a tablet that I can use to get Internet and download movies etc without going through any phone network, just regular wifi and hotspots and getting a pay as you go phone? When downloading movies to tablet, laptop or phone using home wifi, can this add up to extra money on bill? I'm so confused. I thought downloading through wifi didn't cost any extra? All I want is to be able to make calls, send texts, take photos and download movies and watch I player but I somehow seem to be racking up huge bills. Husband in foul humour, says it either my fault or iPhone 5's fault. Won't let me explain. Any advice would be great. Not sure if this should be in IT forum or phone forum so I apologise if I'm wrong.