Sprint which is CDMA in the air and scrambled junk on the wire. The encoding does change and it is obviously wide open on the inside which is why I also excluded the Patriot Act. I understand that this internal flaw makes end-to-end encryption desirable but I was merely suggesting external security is very good. Air sniffing and wire tapping are not feasable unless you are given access which I'm sure a rouge Engineer has. The internal threat from carrier employees does make a strong case for an additional layer of protection.