iPhone: turn off Silent mode (switch on the side) for sound
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Keep the phone face down — almost done
Wipe the speaker grille with a dry cloth. Now test the sound:
60 seconds of multi-frequency pulses (80–300 Hz) — stronger than the free mode. Plus Dust mode and a left/right speaker test.
Check that both speakers work.
Screen, touch and vibration — 1 minute, free.
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