[Q] SE Live With Walkman PHONE-BOOK issue

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http://forum.xda-developers.com – this morning after switching on my phone, it is not showing my contact numbers. tried to restor back up numbers both from memory card & sim card, though it's showing that "contacts restored" but the phone-book is still empty! but when someone is calling, it showing the name but when I recieve msg, its not showing name! phone details- OS - 4.0.4 BUILD NUMBER - 4.1.B.0.587 KARNEL VERSION - BuildUser@BuildHost #1 please help me asap & also I would like to know why this happened :-/ (HowTos)