Buy a Blackphone.
Spies, corporate executives, and serial cheaters have a built-in reason to spend $629 on an ultra-secure Android-based smartphone. The Blackphone is private by design, with a modified version of Android, called PrivatOS, and an array of preloaded apps that encrypt texts, calls, and file transfers. Most of these features are meant to thwart active surveillance and espionage. For those of us more concerned with data brokers, it's PrivatOS that's most relevant – it prevents data from being shared in a variety of ways, including automatically limiting the permissions of newly loaded apps (rather than forcing you to manually denying their ability to share or track data). It's a steep price to pay, but even if you aren't willing to invest in a Blackphone, here's hoping that its modded OS, and obsession with privacy, filters down to more mainstream handsets.