Everything we do in the digital realm - from surfing the Web to sending an e-mail to conducting a credit card transaction to, yes, making a phone call - creates a data trail. And if that trail exists, chances are someone is using it - or will be soon enough.
That's all the difficulty and the challenge and the battle: to look through this mechanical thing, these bits of glass and metal, at someone. And not lose the sense that this shape is a human being.