I have bought a SIM under CEP in mumbai. It worked for 2 days & suddenly it shows unregistered SIM. I have asked the retailer and also been to R.World.But no one has no clue what to do?The R care fellows are so stupid that they even donot know what step to follow to retain the no. My retailer gave me another card, that also showing no network . I donot know what to say about their pathetic & horrible service. Please give me any solution. God save Reliance Communication.