Unlock how?
If your phone says, "enter lock code" or whatever...it's usually the last four digits of the phone number. If it's not the last four digits of your phone number, then it's the first four digits of the phone number originally activated to that phone. If that doesn't work either, try all zeroes. If THAT still doesn't work, then the lock code has been changed by a user since the phone was activated and you're SOL.
You really don't need to use caps.