If you frequently receive unwanted phone calls from the same numbers, you can choose to create a white list of approved callers on your Sony Ericsson phone. Making a white list will ensure that only people you want to hear from can get through to you.
Go to the main menu of your Sony Ericsson phone.
Open the "Settings" tab and go to "Calls."
Click on "Manage Calls."
Select "Accept Calls."
Select "Calls from a List." Choose the contacts you would like to accept calls from and any additional numbers that may not be stored in your directory.
Save the new settings.