even after clearance from TRAI for mobile no. portability, airtel is blocking port no. which is required for switch over to other mobile service provider. even after messaging more than 25 times to 1900, and visiting customer care centers, airtel staff is not cooperating. airtel is blocking and purposly harassing the existing subsciber for not transfering their number to other service provider. can anyone guide me to come out from above said problem. read full review »