I have a Medion mobile phone which is my first smart phone until someone buys me a better one! I have noticed there are data usage charges on my pay as you go account, even when the phone is switched off. I was in hospital last week and the phone was at home, switched off and there was a data usage charge of £1 on there 3 times. Can someone explain to me why that is please and is there anything I can change. I have been on my T-Mobile site which is useless.