Flash On Call and SMS is a free Android application developed by Xavier Apps that uses your device camera flashlight to alert you with blinking lights whenever you receive a call or an SMS. This app is a great utility for people who are frequently in meetings or work in places where they have to keep their mobile phones silent, such as hospitals. The app lets you know about every call and SMS through flash blinks, ensuring you never miss an important call or message.

The app is incredibly easy to configure and allows you to turn on or off LED flash alerts for incoming calls, SMS, and notifications. You can also set the number of flash alerts you want for each type of alert. Additionally, you can customize the LED flashlight's on and off durations and change the speed of flashlight alerts for calls and SMS.