SIM invalid after updating to iOS 8

I have iphone 5, which worked perfectly fine before updating to ios 8.
Its an unlocked iphone which I purchased from Apple Store, Singapore and has been using in India since 2 years and have never faced any sim or network issue
After upgrading my phone to iOS 8, my sim has stopped working. It shows full network bar for a second and then shows sim invalid
I tested my sim in another phone and its working fine with full network
I also tried a new sim card in my iphone but that also shows the same error "sim invalid"
It clearly shows that something screwed up after upgrading to iOS 8
Since my iphone was purchased from Singapore and also its warranty has expired, apple store in India refuse to help
I am not able to use my iphone ever sunce i upgraded to ios 8
I need Apple to help me cope with this problem, since its definitly there new iOS issue

As I said if you want Apple to do anything you must take it back to Singapore where you purchased it because that is the only place that the warranty is valid.
You really should have check into this prior to purchasing it.

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