Sony Ericsson Mugua
Find "Fixed dialling"
Press the Navigation key.
Scroll to Contacts and press the Navigation key.
Press Options.
If required, scroll to More and press the Navigation key.
Scroll to Special numbers and press the Navigation key.
Scroll to Fixed dialling and press the Navigation key.
Turn fixed dialling on or off
Scroll to Activate or Deactivate (depending on the current setting) and press the Navigation key.
Key in your PIN2 and press the Navigation key.
Exit
Press Disconnect to return to standby mode.