I have searched through the phone and I have not seen anything on Security (passcodes, lock codes, etc). Is there an option to lock up phone in case of unauthorized use?
Yes. Unfortunately you can't make a number passcode, but they have a "connect the dots" password that can be used. A bit confusing to explaining but you'll see what I mean. Go to:
Settings > Location & security > Screen unlock pattern (follow instructions to add)