I have got to say I am to trusting, but I wouldn't give a stranger my card details to put into their mobile phone, but if it was my regular hairdresser, beautican I would, but having said that, thats exactly why I chose the invoice lite app, its free, no one puts anything into your phone, you just send the invoice to their PC and they open it up, whilst you'res till there, press pay, and "voila!" they can pay by credit, debit card into your paypal account. I'm doing this as all my customers have been used to paying me cash or cheque, once they get used to the idea that they can pay me by card, also as I'm getting more and more new customers I will probabaly get a mobile terminal. It just narks me to have to pay £200-£300 + £20 pm for the sim + whatever for every transaction, thats £500 per year before you've begun. I don't mind the monthly figure, just annoying as if you were static its free.