iPhone 3.0 Beta 5: AT&T Data Network Problems and Potential Fixes

Apple made mention that some developers, when updating to iPhone 3.0 Beta 5, might experience problems connecting to AT&T's data network. Apple asked any devs so affected to contact them, and one dev who had the problem called in and let us know what Apple told him:
Apple just called me back, had me turn the phone off then back on. Then turn the wifi off and try it and it seems to be back to working. Thaaaank you apple.
Thanks indeed! If you're experiencing similar problems, you might want to try the above. If that doesn't work for you, however, get on the phone with Apple asap.
(Thanks Josh for the tip!)
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.