Airtel — sim is showing no service

I was using sim from last 1 year and suddenly today it's showing no service at all, and i am not able to call or text or use internet in my phone, please do as soon as possible or give me solution of this problem, because i was having internet pack on that sim so i can't even do my work properly and can't even talk with my friend and family. So please so some solution of this problem. Asap