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wifi does not work on iPhone3G after update to iOS 4.0.1?????

Yes, same problem here...

Yes, same problem here too. The moment I updated my 3G to 4.0.1, it appears to have stopped connecting to wi-fi. This has also been reported by other 3G users on the Apple forums.

I've tried the "super-duper-hard-reboot" a few times. I've tried turning the wi-fi off, then back on. I've even tried reseting the network settings, then reconnecting to the networks.

Let me float a theory: Under the wi-fi settings, it looks like I'm connected, with a checkmark by the network name. (My wi-fi options are not grayed-out, and I do not get any messages about being unable to connect.) It's simply that at the top of my phone, "3G" is displayed instead of the wi-fi bars. Is it possible that I really am connected, and the problem is that the wi-fi icon simply isn't displaying? How could I test this? In other words, how can I know for certain whether I'm connected via wi-fi or 3G?

NOTE: I am also going to post this theory in the Apple forums. If I get any useful information there, I'll share it here.
 
Attempting Resets

benji888 said:
...that is what you do if your phone gets locked up and you can't do anything including turn it off...
Click to expand...
I understand what you're saying. Indeed, Apple support says...

"Important: Only reset your iPhone or iPod touch [in this manner] if it is no longer responding."

Ref: http://support.apple.com/kb/ht1430

However, a lot of people advocate doing this anyway, as an attempt to clear other problems. It's worth a try. (But in this case, it didn't work for me either. :( )
 
Resolved for me (I think!)

After not being able to connect to wifi after update to 4.0.1 I tried to reset network settings without success. As I was leaving for work this morning, I reset my router (airport extreme) but didn't wait around to check results, when I got to work the iPhone connected to my work wifi as usual. A friend there said he'd heard about the problem and thought it could be resolved by switching Airplane mode on and off. I tried this and when I got home it connected to my wifi immediately. So to summarise for the many out there that are having this problem I'd recommend 1) reset your router 2) switch airplane mode on and off.

Good luck - I feel fortunate that this seems resolved I hope you have the same luck!:)
 
My wifi stopped working about a week ago. I get the "Unable to join the network..." on all regular wifi spots. I'm still using an iPhone 3G with OS 3.1.3. I tried all the recommended reboots and restores. I also spoke to the genius bar and they won't attempt to help until I do the OS update. It's probably a hardware problem but is there something I missed? I hate to think that I need to buy a new phone to get wifi.
 
Try This

Turn off wi-fi on your iPhone
Log into your router and bring up the list of DHCP clients
Select you iPhone and delete the entry
On you iPhone, forget the network
Turn wi-fi back on, and add your network back

That worked for me.
 
I have this problem as well and anyone that says that the hardware failed or isn't meant to last forever hasn't researched this enough. This issue has spawned numerous threads on apple's discussion boards since the appearance of iOS4. Mine failed a day after updating to iOS 4.0 (and still fails with 4.0.1) Sometimes the wifi is greyed out and if I reboot it sometimes wifi comes back but it still can't find a network. If this is a hardware failure something in iOS4 caused it to fail (possibly overheated?) Either way I suspect in due time everyone's 3G/3GS running iOS4 or later will start failing. People won't notice right away since it'll automatically switch to 3G when they're using the network but it'll happen. I'm actually surprised this has not gotten any attention from the media considering all the hoopla with the antenna. That problem can actually be worked around in numerous ways including a small piece of tape. This problem on the other hand appears to have no workaround. As mentioned by other users simply downgrading the OS won't fix the problem (it may fix it temporarily but it will come back)
 
Icon theory appears wrong

cocoatronik said:
...Let me float a theory: Under the wi-fi settings, it looks like I'm connected, with a checkmark by the network name... It's simply that at the top of my phone, "3G" is displayed instead of the wi-fi bars. Is it possible that I really am connected, and the problem is that the wi-fi icon simply isn't displaying? ...
Click to expand...
This theory appears to be wrong. When I click the blue arrow icon for more information on the network, there is no information displayed (no IP address, subnet mask, etc.).

Also, network speed tests suggest only a 3G connection. Not wi-fi.
 
My 10 month old 3GS will no longer connect to WiFi after the update either. I can pick up the networks, but when I tell it to join, it gives the normal check mark by the network name but indicates only 3G connection in the status bar. Speed tests indicate it is actually still on 3G.

Interestingly, when I restart it while WiFi is still "on," upon booting up it says I'm connected to WiFi for about a second before returning to 3G.

I've restarted and restored it with no change.

Here's a post that sums up the problem and possible causes. The comments indicate this is affecting a good number of people: http://news.yahoo.com/s/ytech_wguy/20100712/tc_ytech_wguy/ytech_wguy_tc3098
 
There is definately a problem with the SOFTWARE, not the hardware,

fizzywizzy said:
Have spoken to all my friends who have 3GS and all have lost Wifi capability since upgrading to 4.0.1. Including one friend who hadn't moved to 4.0.1 and did so whilst I was there and instantly lost the capability to connect. Really frustrating that the supposed iPhone4 fix has only made things worse for the non iPhone4 population. Apple seem to be having a nightmare right now. Anyone know when the fix is due?
Click to expand...

Both my son and I have the same problem, we can get on the internet at home (we don't live at the same address) but neither of us can use edge or 3g since the upgrade
 
iphone 3G wifi problem fixed 4.0.1 OS

Hi, I am no expert but this is what had work for me! First put the phone in the freezer for about 5 min. I wrapped mine in plastic wrapper so there is no moisture getting in. Should this fix the issue and you are getting the signal, sign in and go into option to renew lease on the wifi. After that, go into General and reset the network. All the steps should be done before the phone warm up to room temperature. This has fix the problem for me even when the phone is at room temperature it still locked on to my wifi. Hope this help guys!!
 
Actually, I haven't been able to use WiFi since 4.0! Looking for methods to downgrade to 3.1.2...


cocoatronik said:
Yes, same problem here too. The moment I updated my 3G to 4.0.1, it appears to have stopped connecting to wi-fi. This has also been reported by other 3G users on the Apple forums.

I've tried the "super-duper-hard-reboot" a few times. I've tried turning the wi-fi off, then back on. I've even tried reseting the network settings, then reconnecting to the networks.

Let me float a theory: Under the wi-fi settings, it looks like I'm connected, with a checkmark by the network name. (My wi-fi options are not grayed-out, and I do not get any messages about being unable to connect.) It's simply that at the top of my phone, "3G" is displayed instead of the wi-fi bars. Is it possible that I really am connected, and the problem is that the wi-fi icon simply isn't displaying? How could I test this? In other words, how can I know for certain whether I'm connected via wi-fi or 3G?

NOTE: I am also going to post this theory in the Apple forums. If I get any useful information there, I'll share it here.
Click to expand...
 
Applejuiced said:
You have to open it and replace the wifi chip on the board. Not an easy or cheap fix. If you mess up you can make the phone completelly useless.
Click to expand...

Dude, you are a pretty stubborn guy - you clearly don't want to believe that other people are experiencing issues. Clearly there is an issue with the upgrade. I'm experiencing the same issues with my 3GS that people are complaining about.

Ever since the 4.0.1 upgrade I have not been able to connect to 3 different APs. 1 AP it's a hit and miss with my phone.

They made the signal bars fatter but messed up wifi connectivity.
 
how to go back to ios 3??

WOW!:D I go on vacation, come back and see others have replied and have the same problem... KNOW that this is not a hardware issue, I have had 0 (ZERO) problems with my 3G iPhone since I got it in Feb. '09. When I updated to 4.0, no problems. But when I updated to 4.0.1, all of a sudden the wifi symbol disappeared within a very short time of using my phone after the update. Since then my phone has acted totally normal except it seems it does not find any wifi networks anywhere I am at. :mad: When I go to wifi in settings it is not grayed out, it acts like it searches, it just doesn't find any. This is especially frustrating at home since I have fringe reception at home and can barely text (and that is hit or miss) and am looking at getting the 3g microcell from AT&T. Also note that my roommate has a newer iPhone 3G, and has not updated to iOS 4 and has no issues and uses wifi all the time. But that aside:



my iPhone 3G purchased in Feb. '09 appears to be no longer able to find and connect to wifi networks (after updated to iOS 4.0.1). I have tried everything and the result is that I have lost some data and the phone still works the same. The only thing I have not tried is going back to iOS 3 which I am wanting to do, anyone know how to do this? (I have not gone to Apple since it is out of warranty and I know they won't do anything):confused:

P.S. I just recalled that once in a while when reception is low I get some error about data roaming being turned off, not sure if this is related at all or not.
 
Nevermind, Went Back To Ios 3, No Change!

UGH! I took the trouble to go back to 3.1.3 and I STILL have the same issue!!! WTF? I am taking this thing to an Apple store (which is 90 min. drive away :p) ASAP and tell them they broke my iPhone 3G and to FIX IT!! I'm totally fed up now!! :mad::mad::mad:

hey "phissith"
...the freezer thing, that's a joke, right? WTF? don't you have anything better to do than play with us? put your d**k in the freezer dude!:p
 
I upgraded my iPhone 3G to 4.0.1 and it searches for a wifi connection but never finds one. I bought it May 2009. Apple won't hear my problem unless I pay for support. I know it is the upgrade that caused the problem. Not happy with Apple.
 
I had the same problem with my iPhone 3G after installing 4.0.1
I wasn't able to connect to the any network so I brought it to a genius and they did a deep restore and it didn't help so they replaced it on the spot. The replacement works fine but I'm using an iPhone 4 now :) I had AppleCare on the 3G though. I hope apple does something about it in their next update
 
same here in NZ

I have had the same issue since updating to iOS4, really annoying.

However i had done all that is stated here http://support.apple.com/kb/TS1559

Plus I have talked to my guys re going back to 3 however you can not as the base band for the phone has now changed making it near impossible to revert backwards.

I have tried following some unix coding to reset the base band but haven't had a chance to try as of yet, once I have an answer i will post.

good luck
 
Mine Didnt work either

Yes i too upgraded to 4.01 from the 3.103 or whatever it is
I too couldnt connect through my 3g network i am with O2 in the UK.
They said goto the apple shop and my nearest is Manchester although i only have 7 days left on my waranty..
But i did a check by going into :-

Settings > General > Network > Cellular Data Network >

All the boxes in there were blank this is why the 3g wasnt working

Because i am with O2 i put in the cellular date Mobile.o2.co.uk
left the usename and password blank

and in the MMS i put wap.o2.co.uk and the username was vertogo and password was password

Switched off my phone and all is working

Hope it helps if not ooops:(
 
Just some voodoo magic that worked for me

I was experiencing wifi network recognized. When entering password it said wrong password. Which wasn't the case. Saw a video where dude put his iPhone in a ziplock baggie. Put it in the freezer for a few minutes. And wala. The iPhone 3G running 4.0.1 recognized my wifi. And accepted my password and connected. I call it the freezer reboot

Hope this helps
 
Bad News

I got home tonight and tried my freezer reboot...

It's only temporary folks. Sorry. Seems there really is a hardware problem. Seems the iOS 4.0.1 upgrade makes the wifi chip run hot. So I turned off the wifi function. And bummer for ATT because I have the unlimited plan and my phone is just going to use more of their bandwidth as opposed to giving their network a break when I get home and jumping on my wifi..

Honestly I don't see a software update fixing this problem. My iPad and Mac work fine on the wifi.

My advise is if your iPhone 3G is failing your wifi connection, it's not your wifi, it's your iPhone. Don't torture yourself any further trying to get the wifi to work with it. Most hopeless, shame on you apple..
 
WTF? in the freezer?

Lawrence Sibisk said:
I was experiencing wifi network recognized. When entering password it said wrong password. Which wasn't the case. Saw a video where dude put his iPhone in a ziplock baggie. Put it in the freezer for a few minutes. And wala. The iPhone 3G running 4.0.1 recognized my wifi. And accepted my password and connected. I call it the freezer reboot

Hope this helps
Click to expand...

I want to see this vid, post a link please! otherwise this is total B.S.!! WTF does putting it in the freezer do when a software update caused the problem???
 
Lawrence Sibisk said:
Seems there really is a hardware problem. Seems the iOS 4.0.1 upgrade makes the wifi chip run hot.
Click to expand...

...this makes sense because it was not an immediate problem, I was using the phone at home and suddenly the wifi logo dissapeared, since then it seems to no longer work...but I went back to 3.1.3 and still it does not work! So Apple BROKE my iPhone with their software update!:mad: That could make for a good lawsuit!!!

I don't care if I have AppleCare or not, Apple WILL fix my phone or this Apple addict will turn on Apple and raise a big f/n stink! :mad:They literally broke the wifi in my phone by recommending I update the software!:mad: (I have had 0 ZERO problems with my 3G iPhone until this software update)!
 
Hi,

I have unlocked jailbreaked iphone 3G 3.1.2 software and i have a problem.
2 weeks ago I've installed OS 4.0, and after a week wifi stopped working.

when I'm trying to connect to wifi my iPhone finds network but then the error pops up : unable to join xxxxx

This is what I've tryed to fix in a past week:

- restore to 3.1.3 & 3.1.2
- reset network connection
- reset all settings
- wifi off, push off, airplane on for 5 min and then wifi on
- reset rooter
- try various rooters
- rooter security off


and still it's unable to join...

Can you please help me...
The guy on our iphone servis said that I should clean some things via Terminal but he didn't want to tell me the codes (not for free of course)

thank you in advance and excuse me for my English (not from arround) :)
 
went to Apple Genius bar Saturday...

I went to the Apple Genius bar yesterday and I was calm and just explained that I did not have AppleCare but have had no problems w/phone until I put iOS4 on it. Also told him everything I had tried to do to get it working again. He checked it out, did something to it (also helping someone else w/their MacBook), asked if he could take it to back to open it and check it out. He came back with a new iPhone 3G!! :D I didn't have to make a fuss at all! ...my guess is they know there is an issue (he said iOS4 may have inadvertently turned wifi off) ... in any case I have a new working iPhone 3G w/3.1.3 OS on it, and it will stay that way until 4.1 comes out. The biggest thing I notice is that GPS sucks...they improved the algorithm in iOS 4 for location services (or the GPS function)...all my apps that use this worked better in iOS4, but I'm not taking any chances-keeping 3.1.3 for now.

For those of you that have iOS 4 on iPhone 3G and only problem is it is slow, he did mention that, if you turn off spotlight search it will act normally instead of being slow.

I'm thinking they have an overstock of iPhone 3G since they no longer sell it, they are worth nothing to them, and to give me a new one is probably a tax write off. (now I can wait 6 months until I get full discount for upgrade to iPhone4)

(I know this does not help if you have jailbroken your phone, but if you have jailbroken your iPhone 3G, do not update to iOS4 until 4.1 comes out!).

I am only referring to iPhone 3G, not iPhone 3Gs.
 
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