iPhone & Android

Samsung's steps for unlocking the hidden Developer options menu (tap Build number seven times, then confirm your screen lock) and how to hide it again.

Shows how to assign a double or triple tap on the back of the iPhone to actions such as Control Center, screenshot or accessibility features.

The reference for adb: enabling debugging, pairing over Wi-Fi with adb pair, installing apps, port forwarding, copying files and shell commands. The package manager section documents pm list packages and pm uninstall with -k and --user, the basis for per-user removal of apps. Only remove packages you understand.

Official guide to unlocking Developer options (tap Build number seven times) and what the settings do: USB and wireless debugging, show taps, pointer location, animation scales, simulated color space and more. Menu locations vary by device.

Describes the on-device iOS Recovery screen with Recovery Assistant, Software Update from a nearby device, Diagnostics, Erase, and Recovery Mode. Erasing deletes your data.

Download page for the standalone adb and fastboot tools. fastboot is used to unlock a bootloader and flash system images, which can erase your device and void warranties, so read your maker's instructions first.

Apple's recovery-mode route for an iPhone with a forgotten passcode: power off, hold the model-specific button while connecting to a Mac or PC, then Restore. This erases the phone, so try Passcode Reset first.