Probably each had a situation, when to him did not could will get somebody on the phone because a telephone stay out of zone of action of network. For prevention of such cases was worked out our app - Network LED. Now that a telephone lost a network, he will be able to show about it the LED located above a screen. In the program some tuning is envisaged: color, speed and autostart. Be attentive not on all telephones there is an indicator as a light-emitting diode, and even if I am can not support all envisaged modes of twinkling.