Someone stole cousin's iPhone 4S?

My older cousin got his iPhone 4S stolen. It must have dropped out of his pocket at work or at college. He already contacted the college and his workplace but there was no luck on finding it. My cousin does not have any tracking apps installed on it.

Questions:

- Can the iPhone 4S still be tracked down if the phone was shut off or if the micro sim card is removed? (I heard thieves commonly do this with stolen iPhones)

- The iPhone currently uses 3G and is on a GSM network. If the iPhone is on wi-fi or on 3G mode, can we track down the thief and pin-point the location of the device?

- Can Apple or Verizon actually track it down if the device is downloading apps from the app store or used for calling?

- Does the iPhone 4S have any security or tracking chips installed on it to track the thief easier?

- The iPhone is from Verizon, but can the thief can really unlock or jailbreak the phone?

- Is there a way to erase content in the iPhone 4S without actually having the phone in your hands? (To prevent personal information from being leaked. )

Please help since my older cousin is really bummed from the loss. (And he hates the new iPhone 5 design ).

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