If you enable flash on call (or flash when ringing) in your Xiaomi or Redmi device, the camera flash will blink upon incoming calls. Also, there is an LED notification light feature for incoming messages on your phone. The flash on call and LED notification light features are turned off on your device. To enable flash on-call/ flash when ringing for phone calls in Xiaomi and Redmi smartphone, follow these steps. To enable LED notification light for incoming messages (SMS, WhatsApp, etc.) in your Redmi or Xiaomi smartphone, follow below-given steps. You have now enabled Flash on call and LED notification light in your Xiaomi/Redmi phone. Now to disable both features, go through the above-given steps and turn off both the toggles.