Sony Ericsson T100 User Guide - Page 52

Security The SIM card lock The SIM card lock protects your subscription, but not your phone itself, from unauthorized use. If you change SIM cards, the phone still works with the new SIM card. Most SIM cards are locked at the time of purchase. If the SIM card lock is on, you have to enter a "PIN" (Personal Identity Number) every time you turn on your phone. If you enter your PIN incorrectly three times in a row, the SIM card is blocked. This is indicated by the message PIN blocked. To unblock it you need to enter your "PUK" (Personal Unblocking Key). Your PIN and PUK are supplied by your operator. To unblock your SIM card 1. PIN blocked appears in the display. 2. Enter your PUK and press YES. 3. Enter a new four- to eight-digit PIN and press YES. 4. Re-enter the new PIN to confirm and press YES. To change your PIN 1. Scroll to Settings, YES, Locks, YES, SIM lock, YES, Change PIN, YES. 2. Enter your old (current) PIN and press YES. 3. Enter your new PIN and press YES. 4. Re-enter the new PIN to confirm and press YES. Note: If the message "Codes do not match" appears, you entered the new PIN incorrectly. If the message "Wrong PIN" appears, followed by "Old PIN:", you entered your old PIN incorrectly. To change your PIN2 1. Scroll to Settings, YES, Locks, YES, SIM lock, YES, Change PIN2, YES. 2. Proceed as described in "To change your PIN". To turn the SIM card lock on or off 1. Scroll to Settings, YES, Locks, YES, SIM lock, YES, Protection, YES. 2. Select On or Off, and press YES. 3. Enter your PIN and press YES. 52 Security This is the Internet version of the user's guide. © Print only for private use.