No signal and searching for signal on iPhone 4

My son has a iPhone 4 32g with IOS5. I have a iPhone 4 16g with IOS5. My phone is working great no problems at all but my son's phone 2 days after downloading the new software started searching for signal and no signal, We have done a hard reset and a system restore told us the phone could not be restored.........

I went into the apple shop today and described the same issue. The first question the guy asked was: are you on orange? To which I replied yes! I am apparently the 8th person he has seen this weekend.
I described how it seemed to have happened straight after I downloaded IOS 5 however he said he thought this was just a coincidence. I also told him how I had restored as a new phone several times but it had made no difference.
My phone has a stuck homepage button and he said he could replace my phone based on this as I still had warranty. The new version would have the latest IOS 4 on it and not 5.
Lo and behold a brand new phone WITHOUT IOS 5 still has exactly the same problems. So it must be orange! I'm just lucky I was able to get to the bottom of it.
Next stop - the orange shop.
Good luck everyone
Why does my iPhone 4 have no signal/searching after iOS5 update?

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Try restore your phone back to factory setting through itunes. if that doesnt work or even before that call your service provider since they provide the network they will have some steps to try. if those fall then its hardware most likely

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Here are some observations and a suggestion.
1) I mentioned before, that the number of views of this discussion forum is fast approaching 100,000. I suppose relative to all iPhones sold that is not a great percentage, but 100,000 still sounds pretty impressive to me. Consider also that many people probably have this same Sim problem and are not viewing this discussion forum because thay do not know it exists. How many people are REALLY experiencing this problem? Who knows. But I suspect it is more that 100,000.
2) To the best of my knowledge, Apple does not consult these forums as a guide to awareness of product performance. It may be company policy, but most of the time when I speak to an Apple employee they seem remarkably unaware of the "Top Stories" in the Apple Discussion Forum. This, despite the fact that my personal experience with customer service at Apple is excellent. So, as much as we of this discussion forum are confident SOMEONE important at Apple is reading all our posts and taking them to heart...I am not so sure.
3) I have been told over and over that the best way to gain Apple's attention regarding a problem is to post a comment on their Feedback Site. One comment about a problem is pretty worthless. 100,000 comments on the same issue, I'm guessing, will really get their attention.
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I wish to register a strong concern about my iPhone's unpredictable inoperability due to failures somehow associated with it's SIM technology. For me, I do not consider this just a significant lack of convenience, but a significant safety issue. Should I need my phone in an emergency situation where it is experiencing a SIM FAILURE, I believe the iPhone will have put me at risk. I would ask you to please give fixing this problem your greatest priority and effort.
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If you still see the error message when you update or restore, contact Apple support.
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