Your phone holds your photos, messages, email, banking app, passwords, and location history. For a criminal, a compromised phone unlocks everything — which is why phones are among the most targeted devices in existence.

The good news: your phone already has excellent security built in. Most of the protection you need is just a matter of turning the right settings on. This book walks through them in order: a strong lock screen with fingerprint or face unlock, hiding sensitive notifications, prompt software updates, app hygiene and permissions, silencing unknown callers, safe texting and browsing habits, public Wi-Fi rules, and QR code caution.

You'll also get the lost-or-stolen action plan (locate, lock, erase, call carrier, change passwords), the SIM-swap warning most people have never heard of, and how to properly wipe a phone before selling or handing it down. Every step is labeled for both iPhone and Android with exact menu paths — no jargon, no lectures, just settings.