My 4 month old Xperia SP started dropping network connection with the message "No Service". My SIM card worked fine in other phones and no other SIM card would work in the Xperia SP handset. It did all the software solutions such as checking for updated software and even a factory reset. Nothing solved the problem so I spoke to my provider (O2) who agreed to replace the phone under Warranty. What a surprise when out of the box, the replacement phone had the same fault and would not give any Network Service though all other aspects of the phone worked fine. O2 even checked that the IMEI was not blocked. So another replacement was arranged and thankfully that phone is working fine so far. Third time lucky.
I am posting this so that othe may benefit from my experience and Sony may decide there is a design or software fault that requires further attention. Also to compliment Sony and O2 for honouring the Warranty without any resistance.
