This was in the news about 18 months ago, Your pump has to be in full stop mode before anyone can connect wirelessly. I had a friend who can hack whatever he fancies (he's working on artificial thought processes and computer software etc) He tried to access mine as we were both curious he couldn't he could quite easily when it was stopped but not when it was running. My pump is never stopped so it doesn't bother me. In saying that though who would want to bother too much effort for not much harm (how many people have pumps is it not around 6% it's 3% in Scotland) most people check their bs regularly and the majority of people have hypo and hyper symptoms. A bit a scare tactics me thinks!