I wouldn`t be sending anything financial over the mobile phone signal. I don`t know about here but in America they have a new system where you can plug a widget into your phone and use it to swipe credit cards and do all your banking with it. I wouldn`t touch it with a bargepole.
I've seen articles on how easy it is to get a machine that takes all your details of the "new" contactless dedit cards just by walking it past the card while it is in your wallet or bag. The banks are not admitting that this is a serious threat and so it is the customers fault and the bank does not have to re-imburse the fraud.