Hello, my Airtel prepaid has 1-year validity through Sep. 2010. However, I am in the US now and not using the phone. I sent e-mail to Airtel but could not get them to understand my question, which is, will they close the account even before 09/2010 if I don't use the phone for some months? If so, what are the specific rules, what is the cutoff period, and what do I have to do to avoid it?Another question: my phone will register on the T-Mobile or Cingular networks here in the US (it says Cingular, not AT&T, even though Cingular was absorbed by AT&T some years ago). But then it says "Emergency calls only", which is what you get with an unrecognized SIM (it allows only calls to the emergency number, 911). Do I have to do anything to enable international roaming?Many thanks for any help,