Motorola C332 - Manual (Page 63)

Security - 63
Security
Line Security
If your phone displays Line Not Secure while you are on a call, your phone
has detected another device monitoring the call. This message does not
appear when caller ID, call cost, or other information fills the display.
Locking and Unlocking Your Phone
A locked phone still rings or vibrates for incoming calls or messages,
but you must unlock it to answer.
Lock Your Phone Manually
Set Your Phone to Lock Automatically
You can set your phone to lock every time you turn it off:
Find the Feature M > Settings > Security > Phone Lock
> Lock Now
Find the Feature M > Settings > Security > Phone Lock
> Automatic Lock > On