Whilst Apple host this forum others have posted that it is not necessarily the place where you will get a response from Apple. There are other services provided by Apple if you are seeking Apple to respond.
I have found that to identify the point of failure one must systematically eliminate the issues. Preferably the starting point to resolve this issue is to given the problem to an Apple Genius.
Given that there is nothing in it for me to post in these pages I guess my shallow Defence is to encourage perhaps even help subscribers to think outside of the box when problem solving. And for you to simply know that at least one person with a 3G does not have a WiFi issue at 4.2.1 should have been helpful.
You have not confirmed that you have tested the phone at any other hotspot. Neither have you confirmed that all subscribers experiencing a WiFi issue just happen to have exactly the same same 3G version of the iPhone.
My guess is that the number of unknown persons who use these self help forums and resolve their issues who do not post may well lead others to believe that the problem cannot or has not been solved.
In relation to the weight that can be attributed to the 7 pages of complaints I too have read Daryl Huff. A much better statistic would be to weight the number of subscribers on the 7 pages against the number of 3G iPhones in circulation that have been upgraded to 4.2.1 and operating normally.
Perhaps this will help
http://www.youtube.com/watch?v=kAG39jKi0lI
Message was edited by: adnixon