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Boot on safemode and check again
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Settings > apps > all > smartkey > if you have that app, uninstall it > restart the phone.
are you using a third party phone app?
Boot on safemode and check again
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
thanks 4 ur support