No signal after updating i phone 3gs

sir i a using my i phone 3gs i have a problem in it
it was working fine before in 4.1 thn recently i have updated to 6
since then it shows no NO SERVICE
i tried to do all the posibe ways ike reset settings and a those ways but my signal is not coming all
i brought the phone fro uk n using it in INDIA
the local network i IDEA
but if i put this same sim in other obie sina good
so please help me out of this
thank you

i am having same problem with mine and many others are.

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