The summary.
SET UP REMOTE WIPE BEFORE YOU NEED IT
Afterwards is too late. And use a screen lock with a short automatic timeout.
WHAT USUALLY FILLS A PHONE
Photographs, and messaging media saved automatically.
Disable automatic media download — it consumes both storage and data.
CHECK DATA USAGE PER APPLICATION
It reveals applications consuming data for no visible benefit. Restrict background data for those, and set updates and synchronisation to wireless only.
YOUR PHONE IS A SCANNER
Good even light, document flat, camera parallel, no flash. It replaces a scanner for most purposes.
GRANT THE MINIMUM PERMISSION THAT MAKES AN APPLICATION WORK
Prefer "only while using", approximate location, and selected photographs.
Review periodically — you will find permissions granted years ago to applications you no longer use.
VERIFY YOUR BACKUP IS ACTUALLY RUNNING
It frequently stops when the service runs out of storage, and message backups are usually separate and must be enabled.
Store contacts in an account, not only on the device.
THE STEP PEOPLE FORGET WHEN CHANGING PHONE
Transferring the authentication application. Without it you cannot sign into the accounts it protects.
Keep the recovery codes somewhere separate from the phone.
