i took my data card usb in bihar .then i took one airtel sim card in bihar itself in which no voice calls can be made but that is only for internet & sms.i recharged in that one plan that is unlimited browsing & downloading for one month of prepaid plan at RS498/-on 19/06/2009.so i got my net connected . but when i came to tamil nadu, chennai, then my net was disonnected on 12/07/2009 and i got one sms that you are in roaming 19/07/2009. again on 28/07/2009 one sms i got that you are in roaming. but when i recharged my prepaid data... read full review »