Try to change RMN to airtel.It states that my mobile number (Airtel) is not recognized.
FYI - I have give my vodafone no as RMN.
Walk in to nearby outlet they will assist youI am unable to change my RMN at this point of time as it asks 3 question out which only 1 is application which is providing pin code details 2 and 3 is all about last recharges.