IOS 5.1 Upgrade for iPhone 4. No call audio as it was in iOS 5.0.1

Previously I upgraded my iPhone 4 (16GB Factory Unlocked) from iOS 4.3.5 to 5.0 and 5.0.1 onward. It just made my phone dumb. There is no call audio at all. I upgraded my iPhone 4 today from iOS 5.0.1 to the current relese of 5.1. The prombel remains same here in my case. When I call speaker on/off pad always shows on. And as previous there is no audio in call, no ringback tone, to sound of opposite end, nothing at all.
I wished iOS 5.1 will take me out of this problem when it has been reported a lot about this bug. My original iOS was 4.3.5 and I beg apple to give an option to downgrade the iOS as it seems that in the name of upgradation they are losing quality, faith of the users and making phones invalid or disable.
What will I do now?

S. M. Mahabubul Alam, Apple just robbed me of $150 bucks because it was out of warranty.  I have a simliar problem, I was being muted on telphone calls after i upgraded to iOS 5.1 on my iphone 4.  They blamed my hardware, but never had an issue with this prior to the upgrade.  They need an option to downgrade. 

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