I have an iPhone 3GS. In 2G mode total bars, in 3G mode "no service". Why?

I have an iPhone 3GS. For the past two years I lived near a small, municipal airport in CT. Before I moved there, I was living in a rural area of CT and the phone worked great in 3G mode. As soon as I moved near the airport the phone would not work in 3G. I was told sometimes this happens and to switch to 2G. I have now moved to Florida. When the phone is in 2G mode I have all bars and the phone works great. As soon as I switch to 3G the bars dissapear and "No Service" appear where the bars should be. What's up with this?
Phil

More than likely interference. Have you checked the AT&T coverage map? It might show your area as having a lack of decent coverage. Airports tend to be big interference causers due to the metal and other various stuff. My work is located across the street from a busy airport and I get 2 bars MAX on 3G and this is with a cell tower less than a quarter mile away!
A few things to try to check if interference is the cause, go to settings>general>reset and choose RESET NETWORK SETTINGS. This will make your iPhone reboot and also too if you connect to WiFi sources you will have to re enter passwords. After it reboots, test the iPhone...
If that does not work, go to settings and turn Airplane mode on for a minute then off. Test.
If that fails to fix the issue, try resetting your SIM card. Take a small paper clip to the pin hole on the top of your iPhone and stick it inside that hole. The SIM tray will pop out. BE CAREFUL as to not drop the SIM card. Then, push the tray back in. TEST
If those fail, you have some interference. However, as a surefire method to test you can restore your iPhone and test it afterwards but thats up to you.
Also, you might want to see about getting a new SIM card from AT&T

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http://theiphonewiki.com/wiki/index.php?title=ITunes_Errors
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i ... it wont turn on when i plug it in to my pc.
Place the Device into Recovery mode... All data / Content will be Erased.
http://support.apple.com/kb/HT1808
Note on Recovery Mode.
You may need to try this More than Once...
Be sure to Follow ALL the Steps...
Once you have Recovered your Device...
Re-Sync your Content or Restore from the most recent Backup...
Restore from Backup
http://support.apple.com/kb/ht1766
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http://support.apple.com/kb/TS1567
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Get help with Mail on iPhone, iPad, and iPod touch
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