An analogy would be, when the police have roadblocks on the freeway, taking side roads. Or even more on point, if you know there are cameras on the freeway, taking a rural backroad that lacks even pavement, and isn't worth installing cameras on.

An interesting little hybrid technology has come along I've been playing with: Software Defined Radio (SDR), which in practice means a little USB stick and an app or PC software. The SDR, as the name implies, is a universal radio: Software tells it where to tune, what modulation and bandwidth to use, etc. Most common are receivers, but you can get transceivers too. Saw a video for one, couple years ago, which made no bones about using the system to send encrypted messages to evade government surveillance. One vignette showed a kid running out of dope, and using the SDR transceiver to send an encrypted message to his dealer, who came to the rescue within minutes. Seriously.

The point being that radio isn't as dead as you think. It still exists alongside smartphones and the Internet, and can interact with it in creative ways. Old technologies have a way of doing that, and becoming so intertwined in our infrastructure that they never completely go away.