I phone 4 network signal issue after updating 4.0.1

hello friends
please help me on this issue urgently
i purchased iPhone 4 working absolutely fine
then i update ios from 4.0 to 4.01 now i got network issues
signal not showing full... what i do please help me urgently on this issue pleasr
Rgds
Mohit

I have similar problem but with a 6:   bought new iPhone 6 four days ago, phone and 3G signal were fine in UK from Sat to Mon.   Yesterday, I traveled to Belgium and have had 'no service' problem since.   I am carrying a Nokia feature phone which is locked on to local network and working fine.  
If I power off the iPhone and power on, it comes back and joins the network.   Five or so minutes later, it has dropped the network and will not re-attach if I put in/out of flight mode; needs power reset, and then drops again.
It is conceivable that this is a carrier issue but given that Nokia is fine and all the postings that I'm finding on various discussion sites, then I feel that it is an iOS issue.   I'm booked in to visit the Apple Store at the weekend.   My previous iPhone 4S was running iOS 7 and had no such problems.  
So, carrying an expensive brick at the moment and hoping for an iOS update that will resolve this. 

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