Here’s an interesting article about the Loss of Wi-Fi connectivity plagues the iPhone 3G as well.

Wi-Fi connectivity problems are not limited to the iPhone 3GS, not by a long shot. The iPhone 3G is widely reported to have connectivity problems that, according to the large number of people discussing it on the Apple Support Discussions, dwarf the reports regarding the 3GS.

In over fourteen Apple Discussion threads, over six hundred messages have been posted with the first one being written on June 17th, shortly after the release of iPhone 3.0 software. These threads have been read by thousands of users. Unfortunately, to date, a solution is not at hand.

The problem, verified by many, is that when updating to the new software, Wi-Fi connectivity on the iPhone 3G either decreased or vanished entirely. Those who were used to getting full bars of Wi-Fi connectivity now experience markedly less bars. Worse, even if some signal strength bars are displayed, often there is no Internet connectivity.

Many solutions have been proposed including resetting the router, changing settings (seemingly at random), and even putting the 3G in the freezer:

“Also i might note, I turned off wifi, turned off the phone, put it in the freezer (in a bag) for 10 mins, turned the phone back on, put the phone right next to my wifi antenna and then turned on wifi and it joined, it JUST joined and I couldnt believe it,” says one forum poster. Several others report similar results, but this fix did not last long. In fact, blog posts have been written about possible solutions, but none of them seemed to pan out after using Wi-Fi for a short period of time.

Some writers have said that the 3.1 update will fix the problem while a larger number say that the new software release won’t help at all.