Anybody doing credit card fraud would have a somewhat better chance of staying undetected if they knew you usually whereabouts. Credit card companies use highly evolved software to track if a CC transaction is unusual.
I think it is save to assume that most people do not store their credit card number in plain text on their computer. If some piece of software (eg, a browser) would do this, wouldn't this be something you preferred it would not do?
Ahhhh..... dude... I'm more worried about my wallet being stolen.
Again... the tower tracking does nothing and for your average crook to put your iPhone database together with your physical credit card... for what? They slash and burn not sit there and try and sort out if you go to Target or JC Penneys more. What do they care?
Come one people... think and come back to earth.