Iphone 4 frequent no service or zero bar service after updating IOS5.1

It's been weeks and i've been getting this No Service or zero bar service issue on my phone since after I upgraded the IOS5 then to IOS5.1 hoping the issue would be fixed. Instead it got even worst.
This isn't jailbreak version. Can apple please provide an update as soon as possible???
I've did everything I can but i'm still unable to solve issue. I've reset the phone, shutdown, ask for new sim card from carrier, cellular data disable and then enable, take out the sim card and put it back. I also tried to find a way to downgrade my OS but seems like there is no way back at all. PLEASE APPLE, if you can't provide an update, then allow us to downgrade the OS for the time being!!! How are people suppose to get intouch with us if the phone keeps getting this no service error. Not only am I frustrated but the people who are trying to get intouch with me are also frustrated.
PLEASE DO SOMETHING SOON. I NEED YOUR HELP APPLE

so have you brought your phone to Apple for evaluation?

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Iphone 4 frequent no service or zero bar service after updating IOS5.1

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