I find it very unlikely that a Telco will voluntarily do the police work. These things are probably part of some international treaties and doing it legally wil

I find it very unlikely that a Telco will voluntarily do the police work. These things are probably part of some international treaties and doing it legally will be hard, even if they do it and block a telco from one of the worlds most populous country the scammers can simply change SIM cards and use a new operator. The scam calls are probably very, very small percentage of the call volume. Why would a telco start international dispute, deny calls for their legitimate customers? What's more likely is that the US and India sign some kind of cooperation for fighting crimes and scammers being dealt with by the Indian authorities upon request by the US ones.