My android which has a Airtel 3G sim is not able to call any STD number of delhi as it says"Dialed number does not exists, please check the number and try again."while the number I am calling(Tata Indicom, Delhi) works fine from Reliance, Idea, Voda.Same story when I am trying to call Reliance number of Pune ??This stupid problem is making me carry another phone along as I cannot call my frequently called people when I am using Prepaid Airtel of U.P. (East)is anyone experiencing similar shocks from Airtel ????