Just Updated iPhone 3GS to iOS5, Can't receive any incoming calls at all

Hi, I just updated my phone to iOS5 and now, I'm having these troubles.
- Can't receive any incoming calls at all
- The incoming calls directly goes to voice mail greeting
- No incoming rings & no missed calls alerts
- Also noticed the incoming text with 4 to 5 hours delays
- Sometimes 3G network get lost
The reception (status bar) is good level, can make outgoing calls okay and can send text okay.
I did try reset the network setting and it seems working a few hours then went back to troubles (mentioned above).
I've done 3 or 4 times reset but none have been resolved yet.
Anyone having a same issues?
I have
iPhone 3GS with iOS5
Network with O2 UK
Thanks,

After reset "All network settings" a several times, it seems working but few hours later it 's been gone back to troubles again.
Is this related to iOS5 or O2?
I've contacted the network carrier several times but no-one yet get back to me.
Any ideas, please helps.
Re: iOS5 updated and all incoming calls going straight to voicemail 

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