Iphone 4 no longer can hold a signal

My not-quite 2-year-old iPhone 4 (not S) now cannot hold a solid 3G signal. Whereas I used to be able to make calls from my office (concrete tilt-up, outside wall, near window) and from anywhere within my home, I now get dropped calls all the time or text messages will not go through.
I took it to Verizon and their first question was if I have an extended warranty with them or Applecare, which I don't. They then reprogrammed the cell tower sync by dialing *228, option 2.
That hasn't semed to work. My next option is a Genius Bar appointment, but I strongly doubt there will be anything they can do.
Is this a case of antenna failure?
Tony

Since you are close to two years, your best bet IS the Genius bar appointment. My experience has been they go out of their way to help customers.

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IPhone no longer can sync with iTunes on Mac Intel Mini

I have an original iPhone (not 3G). It was working fine until today. Today when I booted my mac mini, Software update said that there was an iTunes update. I downloaded and installed version 8.2 of iTunes. When I connected my iPhone to my mac mini (Intel running 10.4.11), which is what I use to sync my iPhone, iTunes didn't see it. It was as if the iPhone wasn't connected to the mac.
I thought maybe it was the cable. So, I switched cables. It still didn't sync (or even see the iPhone).
I have been charging my iPhone using a wall adapter, so I tried both cables with the wall adapter. The iPhone charged just fine using both cables.
I used the cables and tried to sync my iPod Classic (120GB) with iTunes. I can sync my iPod Classic with iTunes just fine with either cable.
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I'm back at square one. My mac Intel mini running 10.4.11 can't see my iPhone and nothing I do seems to help it see the iPhone, but I can sync my ipod classic using the same cable.
I'm now wondering if there is something wrong with the iPhone. Has anyone else seen this problem?

Sometimes a glitch can happen with an itunes upgrade that can cause itunes to no longer recognize your iphone. If you have already tried to restart your computer and tried different usb ports, I would try this:
http://support.apple.com/kb/HT1224?viewlocale=en_US
Hope it helps
Your only removing the outer software so it shouldn't affect your itunes libraries or files.

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I recommend you reset the TC in the following ways.
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I also lost the possibility to use iPhone as a moden to Internet. But that I managed to fix at least on my old MB.
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TS3694 phone does not hold a signal

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I did the ios 5 update for iphone 4 and can no longer see the pics i take in the camera app or camera roll. nothing will let me see them the page just goes to no photos or videos. if anyone knows a solution or a fix it would be greatly appreciated. thanks

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Hi there,
For some reason (and I don't think it's the USB connection... I've tried two) by iPhone no longer shows up in the iTunes window when I connect it to my MBP. Consequently, I can't update my Address Book, or anything like that.
Does anyone know what I can do to correct this? I've tried restarting the phone (a 3G, by the way, running the new OS)
Regards, Malcolm

Malcolm Hamilton wrote:
now I have no music in iTunes. Luckily, I'd renamed my iTunes folder, and moved it onto my desktop. I thought it would be a simple matter of replacing the new (empty) iTunes folder with my old one, but this doesn't seem to work. Can someone tell me the best was to get my 3,000-odd songs (and the folders/playlists they're in, etc., back into iTunes?
If you move and rename the the iTunes folder you won't see any music in iTunes the next time you launch it. You can quit iTunes and rename it then put it back or leave it and launch iTunes while holding Option to choose the location of the iTunes library.
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How to open an alternate iTunes Library file or create a new one
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If the iPhone remains under warranty and it is determined the battery has a problem, the iPhone will be exchanged under warranty.
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First thanks for the reply and second sorry about the confusion. I was unable to get the full message out, but here's the problem:
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Iphone 4 no longer can hold a signal

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