Nowadays, everyone gets their own number instead of one number per household.

GPS, webcam, speech, orientation, etc.

Don’t jailbreak or root your phone.

SMS short message service

MDM mobile device management system

iOS

Android

https://www.businessinsider.com/neil-degrasse-tyson-the-time-on-your-android-phone-is-incorrect-2012-3

Android apps come in as APKs (Android PacKages)

APK contains all application files and DEX files (Android bytecode/binary)

To reverse the APK into source code to conduct static analysis, convert the DEX into JAR (Java Archive)

Then decompile JAR into Java source code

Basically: APK->DEX-JAR->source code

Android Studio

GrapheneOS