Derek wants to know how secure cellphones are today versus 20 years ago. Leo says that they are secure because of digital networks that are encrypted. Back in the 90s, cell phones were analog, making them really easy to eavesdrop and "snarf." It was even possible to clone them. But just because you have digital security, doesn't mean you're completely secure. Law enforcement can pay a small fee and get the meta data from your wireless company via a pen register request. Also, there's GPS data, super cookies, and social interaction. If Derek really wants total security, he'd have to get a burner phone.