Iphone 3g 2.2.1 internet problems

I just recently updated my iphone to 2.2.1 and ever sence I have had trouble connecting to te internet using the AT&T 3g internet. This includes safari, the app store, itunes, mail and anything else using the at&t internet. Im fine in wifi but very spotty in 3g. Occasionaly it will connect but very rarely. Does anyone have any ideas for solution or whats going on?

I repro'ed this issue with iPhone OS 2.2 (2G phone) so I don't think this was caused by the 2.2.1 upgrade, but rather bad timing that AT&T upgrade 3.1 was not included with the new OS and iTunes isn't going to check for an update for one month after 2.2.1 installation (see screenshot below). I had to manually click the "Check for Update" button in iTunes.
I wrote up what worked for me (it was a day and night difference for my app). You can find it here:
http://www.feedd.com/faq_carrier
I also talked with AT&T customer service this morning and they told me they were not receiving any complaints of iPhone issues...

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