This is not how general relativity works at all. If your coordinates are set to a spot on Earth (or some spot relative to Earth), you will appear at that same point. Spacetime exhibits something called diffeomorphism covariance which is a fancy way of saying you’d have to go out of your way in the dumbest way possible to get this outcome.

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Anyone who thinks a secure messaging app is all they need to keep their communications private from government snooping is a fool. All of the end-to-end encryption in the world won’t really accomplish anything when there are any number of other ways to read your screen, log keys, etc. The app just encrypts messages, what happens after that on the user’s device is outside of the app’s design.

Never assume any digital device is safe. Never.