I have the same problem. After upgrade to iOS 4.3.2 the wifi did not work. Only my wifi at home to what the iphone was connected during upgrade does not work. Other wifi's at work and in other places were detected and connected to.
Reset all network settings-did not work
Switch power off and on - did not work
choosing others in settings/network/wifi and entering the name and password of the network - did not work (Error: "could not find the network")
upgrade to iOS 4.3.3. - did not work
The WiFi address (setting/about) is CC:08:E0:5E:CD:F4
Is anyone having the same problems and knows how to solve?
I upgrade to 4.3.2 about a week ago, and since that point have not been able to use my WiFi connection.
Weird thing is, at first it said (no WiFi) under the network options, then a few days ago it changed back to the normal on/off WiFi option. Tried to enable it but didnt get a network list with available networks. typing in my network settings didnt do it either; got the same error you did.
Even tried restoring old iPhone backups but that just didnt do nothing but screw up my calender and contacts, not rollback iOS version like I thought it would.
still stuck with no Wifi and probably a huge phone bill!
d/l'ing 4.3.3 not to see if that helps any.
Resetting the network settings worked for me although my problem could have been different. Mine would connect into an authenticating wifi network like at McDonalds or in a hotel but when I opened a web page, the login page would not come up so I was connected but could do anything. Reset the network settings and then it worked. First time I have ever had this problem with upgrading.
UPDATE: Strange enough, I went home and login to my home network. No problem, I got Internet like normal. Wifi adjust itself on top of 3G.
It was not like that at the office network. No matter I reset the network and restart the iPhone, all I am getting is just network connection, without Internet connection.
I am sure this is in relation the the latest update. I did not update my iPad 2, it is working fine with office wifi network.
I've been following a ton of threads with this problem and am ever hopeful that I've found a "solution", even if it would need to tested over time:
My TimeCapsule had the channel setting at 'automatic' and defaulted to channel 11, so I manually changed it to another channel (tried to pick one that doesn't come up too often when scanning for other home wireless networks). So far, my connectivity issues with my iPhone 4 (and iOS 4.3.3.) have vanished! My iPhone connects immediately and (so far ... about 2 hours) has remained connected.
Sure, there should be a fix to this issue to come from Apple (iOS 5?, if not 4.3.4), but as a workaround it seems to work.
Hope this helps somebody.
I tried to change my time capsules channel settings - did not work
Resetting the time capsule channels to automatic - did not work
Hard reset -did not work
The apple support line recommended to do a restore as a new device to factory settings. All my personal data and settings will be lost!
I am very unhappy to do so, but no other chance
Factory reset did not work! The iphone can't detect my time capsule WiFi. After the unsuccessful attempt to connect to the WiFi, I could at least do the sync with iTunes and got my data back. Maybe the problem could be solved by undoing the upgrade to iOS 4.3.3 and reinstalling iOS 4.3.1. Does anyone knows how this has to be done?
I had the same problem, after update my iphone iOS to 4.3.3 version it could not connect to my home wifi network anymore (but it could connect to wifi at work with no problem), and now it just fail some times, taking like 5 minutes to connect when it fails and the solution was change the Wifi Security from WEP to WPA-PSK/WPA2-PSK. The problem is still there, but now i can use the iPhone at wifi. We hope that the next update fix this problem (i didn't have any problem with 4.3.2 version). My Router is a D-Link DI-524/150.
I have tried reset network settings, reboot router, change channel and nothing works.