By default, all satellite operators are blocked in India. I haven't checked in last year or 2, you cant even use Garmin emergency devices which are becoming common in west outdoors. To use the satellite phones, you need to apply to the federal gov (called Central gov in India) and you can rent the phone from ministry. Atleast, thats the process for tourist or who are entering India from other countries. There are some changes happened in last 1-2 years, few satellite companies got the lic to provide services, but I am sure all the devices and services are highly regulated.