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Open iPhone Settings → tap your name → Subscriptions → LED Banner → Cancel Subscription. Cancellation takes effect at the end of the current billing period.
Display modes lock screen at maximum brightness for stadium visibility. This is intended. Exit the display (tap the screen) when not in use to restore normal brightness.
Check that you allowed microphone access during onboarding. You can re-enable in iOS Settings → Privacy & Security → Microphone → LED Banner. Sound is processed locally — never recorded or transmitted.
Yes. Sign in to the same Apple ID, open LED Banner → Settings → Restore Purchases.