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Hi, if you can i would first of all take it into where you purchased it if they are your network provider or basically your network provider & let them look at the phone....they may just tell you to send it off to your local Xperia Care tho which is looking like your only option i'm afraid :smileysmileythumbsup:
.....also try a PCC today....link below 
http://support.sonymobile.com/us/tools/pc-companion/
http://support.sonymobile.com/global-en/tools/bridge-for-mac/
I also have exactly the same problem, I am without service, and also the touch have problems and the camera button does not work
Sorry for my bad English