1) Taking a cell phone without permission is theft. You could report the boss to the police and/or sue him for its return. 2) Invasion of privacy is a tort–that is, the boss could be sued for invading your privacy, assuming he’s doing things that the average reasonable person would find intrusive.
When you call a dead phone does it ring?
Answer: A: With a dead battery it should not ring but it should go to voicemail directly.