Sim Memory

On the main screen;
Type a number (except 0) and press #
i.e. pressing
[3][5][#][YES]
will call the number in the 35th position on the SIM.

Another way:
Put use sim memory to No:1 in short cuts. Long hold left arrow (left joystick) from standby, you can access sim directly.
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Sony Ericsson Tips