How to enter the SP (Service Provider) unlock code for Ericsson and Sony Ericsson phones:
Switch ON your phone without Sim card
Press 1 time the left arrow
Press 2 times the button *
Press 1 time the left arrow
'Personalize with MNC2' will appear
You can now enter your unlock code
If your phone has a 'JOGDIAL' (ex : SonyEricsson K700i, P800, P900, etc. It's a scroll button on the left side of the phone) you must press 'Down arrow' instead of 'Left arrow' for step 2 & 3. We mean by 'Down arrow'' scrolling the Jogdial down one notch.