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Sorry mate that kind of app doesnt exist,try locking whole phone.Default code is 12345
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theres an app which can hide ur inbox and sms
search aims migital smartguard in s60 apps section
ur problem solved.
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try using Advanced device locked

http://www.imserba.com/forum/showthread.php?t=107305
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ya u can use that but its so complecated that u will get fustrated with it........ belive me