Tip if you've cleared your call list

Go to Message -- Write New -- Press yes -- in the menu to let you key in the number, press the left arrow key as usual to go to the following list.
Phone book, Groups, Sim entries and Unsaved nos.
Select Unsaved nos, there you will see 10 unsaved number.
Those numbers can't be erased when you clear your call.
---

Sony Ericsson Tips