While the messages are encrypted, if the police wants then they can get your name, IP address, mobile number, location, mobile network and your mobile handset type. The cops can also get to know with whom you are chatting, for how long and at what time. Also, the police can access your contacts as well.
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.