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I'm Brazilian, and bought a Xperia Dual E3, but his microphone is not working, and it is new, has only one week.what should I do?
Take the phone back to the store and/or contact your local Xperia Care
http://support.sonymobile.com/global-en/contactUs/
Other things to try
Boot on safe mode and see if the same problem persist
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
or repair your phone with PCC
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
It'll be wise to check your phone with Xperia Diagnostics
https://play.google.com/store/apps/details?id=com.sonymobile.androidapp.functiontester&hl=en
