I know for a fact If you use "signal" matrix or whatever "security" app, you will get branded a terrorist in India, your life will be upended and you will face a long list of problems. https://timesofindia.indiatimes.com/india/ats-probes-use-of-... https://www.aninews.in/news/national/general-news/accused-da... https://www.deccanherald.com/india/secure-messaging-apps-lik... https://india-employmentnews.com/tech-categ…
India also bans most satellite phones by the way. I have one so I looked into that as to not get caught out travelling.