When a cellular phone becomes equal to a Stone!!

I have this cellular phone from Iran Telecom. I came to work today and interesting enough since around 9:00 am. I can't dial anyone and no one can call me!!!
I believe this is when we say a cellualr phone with value of one million Toman From Iran Telecom has a value of a simple stone!!:-) Happy Shab-e Cheleh when there was no technology!!!