I'm having problem with my prepaid number(9903578216). I was outside West Bengal for three months, this SIM was switched off since then. I just came back yesterday, and when I turn it on, it says "SIM Registration Failed" . If I am not wrong, it was valid up to 29th Nov.'2014. How could this be possibly happened? I really really need this number back. Do I need to recharge it to activate the SIM again? I need this SIM working by 15th August'10, its an emergency!

Please let me know the status & remedy ASAP.

BTW, I've send an email to:- 121@airtelindia.com, STILL NO REPLY.