On various models of Sony Ericsson phones, a security code protects user access. This code is known as the PIN, or personal identification number. When the security lock is enabled, you must enter the PIN to access your SIM card, which contains your personal information. Your network service provider initially sets up your PIN, but you can change it after you have unlocked the phone. The process for changing the PIN varies slightly on different Sony Ericsson models, but it follows a general pattern.
Unlock your phone with the PIN provided by its service network.
Find the "Settings" selection on your phone if there is one. On many models you can find this selection on the main Menu screen.
Find the "Security" selection. If you cannot find it directly within "Settings" or if your phone does not have a "Settings" selection, look for it under comparable selections, such as "Tools," "Options" and "General."
Find and select "Change PIN." This option may be under selections like "Locks" and "SIM Protection."
Enter your new PIN when prompted and select "OK" or "Enter."
- Some Sony Ericsson models may contain an additional security password to protect the phone from use if someone changes the SIM card. To change this password, follow the same steps but change the phone protection code or phone password instead of the PIN.
- Consult your phone's user guide for steps specific to that model. Most guides are available at Sony Ericsson Support online.
- If you enter the incorrect PIN too many times in a row while trying to unlock your phone, your SIM card may be blocked. To unblock it, you must enter the PUK, or personal unblocking key, which is provided by your service network.
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