Ok, so I'm planning on going on vacation in the U.S. but a different state. My dad, who still pays my Cingular bill, can't know about this trip. My friend told me that Cingular bills used to say where the calls are coming from so if he looks at my bill, he'll see where I was. Is this true? And if so, is it only regarding outgoing calls or is it incoming too? Thanks for any help you can give me.