I have same problem from last week. I did hard reset and also did *#*#4636#*#* network settings but no solution. Sim changed but same problem, all SIMs works well in other mobiles. I contacted 3 Sony service centres, but they told they only handles software problems ( Which I already did hard reset by PC companion with Volume Down Key press) not hardware, so they don't inspect. My mobile is 15 months old so out of warranty. No service centre do hardware repair, they told me swap your mobile with Xperia xz1 by paying Rs 14000. Very bad service if company don't repair there products who will did ?
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