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my device is hardly one year old.now it is not accepting sim card.it is showing that no sim is inserted while it is still there.there was a problem just like this few months earlier i then had it sorted at sony customer care centre.it was running as usual but out of nowhere it has started again.and now even the warranty is off.this is very bad.VERY VERY BAD SERVICE...TOO MUCH OFFENDED. ANYONE READING THIS PLEASE DONT BUY SONY EVER.... NOW SONY WILL CHARGE LOADS OF MONEY FROM ME JUST FOR A LITTLE SERVICE. MY BUYING DATE WAS 14-10-2013 THE PROBLEM STARTED IN 20-10-2014.**bleep**
Get a brand new SIM card and try again.
It will be wise to contact your local Xperia Care
and/or repair your phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
but it seems to be a faulty SIM card