To make sense of encrypted data, you need the key to the code, which on your phone is often your PIN number—get past the lock screen, and your files and apps are no longer gibberish. That’s why

Encrypt Android device for Intune | Microsoft® Docs Device encryption protects your files and folders from unauthorized access if your device is lost or stolen. It makes the data on your device inaccessible and unreadable to people without a passcode. Before you can access school or work resources, your organization might require you to: How to Encrypt an Android Phone to Keep Information Safe Mar 17, 2020

What happens when you encrypt your phone? | AnswersDrive

Nov 14, 2017

How to Encrypt Your iPhone: iOS 11 Screenshot Guide

So if you start an encrypted conversation on your phone, that’s the only place you can send and receive encrypted messages for that particular conversation. Advertisement.