A repair technician may need your passcode to test that the phone works. That passcode also opens your Photos, Messages, and the Hidden album.
Best option: back up and erase
- Make a fresh backup to iCloud or your computer.
- Turn off Find My (Apple requires this for most repairs anyway).
- Settings → General → Transfer or Reset iPhone → Erase All Content and Settings.
- Hand over the phone with nothing on it. Restore when you get it back.
This is the only way to be sure, but it takes time.
If you can't erase
- Use Repair Mode if your device supports it. It limits what the technician can access.
- Move private photos into an encrypted vault that uses its own secret, so your passcode doesn't open it.
- Empty Recently Deleted in Photos.
- Sign out of messaging apps that show photo history.
- Temporarily change your passcode to one you'll never reuse, then change it back afterwards.
When you get it back
Change your passcode, check Settings → Face ID & Passcode for any added appearance, and review Settings → General → VPN & Device Management for any profiles you didn't install.
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