Spirit M1 - Manual (Page 108)

90 Section 2C: Setting Your Phone’s Security
Changing the Passcode
To change the passcode for the specially-formatted SMS
message:
1. Select > Settings > Security, and then enter your lock
code. (The Security menu is displayed.)
2. Select Others > Found Me > Change Passcode.
3. Enter a new passcode (11 digits).
4. Re-enter the new passcode.