I have this unique problem with my xperia z which I bought a month ago in India.
My following issue happens at times and it doesn't follow any cycle.
My Airtel network signal shows full strength but when some one calls me they get network tone "Number not reachable or out of coverage area". When I try calling during this blackout, no calls or messags would go through my mobile. I can use all the apps during this time. A hard restart would solve my problem when i face this. However the issue is I won't know when my phone is going in to this state, Unless some one say to me personally or call on my other mobile to inform that my number is not reachable.
This happened atleast 5 to 6 times in the last one month.
Someone please help. I cannot take this to service center as its not a permanent issue.
PS: I have disabled STAMINA mode on day 2 itself as I observed that network signals are lost when my phone is going to STAMINA mode.
