Place this whistle at the exact frame a phone screen lights up in your edit, preceded by an app button tap for the unlock action, then follow it with your spoken reaction line so the alert cues the response.
About this sound
This clip is a short whistle melody lasting just under two seconds, played as a clean electronic tone with a light, chirping character. It feels cheerful and attention-grabbing, like a friendly nudge rather than a harsh alarm. It comes from Samsung as the whistle tone associated with the Galaxy S2.