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iOS4 on 3GS - No WiFi

130483 Views 268 Replies Latest reply: Jun 7, 2012 10:43 PM by RockNRollSam RSS
  • KoobcamUser Calculating status...
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    Aug 5, 2010 11:49 PM (in response to chiefscout)
    Read that same thing myself. I opened up my 3G and checked the 6th connection and it was on nice and solid. It seems to me there would be issues with getting a wifi address in the settings menu if there was a bad or faulty connection of the wifi cable or chip. My experience has been that a restore has not worked, checking the cable connections has not worked. Resetting network settings worked once for about an hour then it just dropped the wifi connection. I'm on 3.1.3 and I've never had a wifi problem yet until a couple days ago. No upgrade to 4.0 or 4.0.1. No sudden drops or fumbles and I've definitely used the wifi in a much hotter climate than on my desk testing it.
    Macbook CD 2ghz, iPhone 3G 16GB, Mac OS X (10.5.8)
  • Xarro Calculating status...
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    Aug 6, 2010 1:56 AM (in response to KoobcamUser)
    My brother visited unlockit.co.nz with his iPhone through Wi-Fi and followed the instructions, created a profile, and it solved the problem - without having to reset his hole phone (wich can be another solution). I dont know if it's the ideal solution, but it works
  • KoobcamUser Level 1 Level 1 (0 points)
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    Aug 6, 2010 2:44 PM (in response to KoobcamUser)
    Update: it looks like it's all failing hardware for me. 5 minutes in a ziplock bag in the freezer, pull it out and Wifi logo is showing in the top left of my screen and sure enough my networks pop up in the settings screen. I join and enjoy the bliss of about 5 minutes of quick wifi downloading action before my logo disappears again and I'm back where I started. I do have a legacy unlimited data plan so I'm not sure I'm prepared to melt my logic board in the oven quite yet, but I'm definitely out of warranty. Decisions decisions.
    Macbook CD 2ghz, iPhone 3G 16GB, Mac OS X (10.5.8)
  • SimpleServe Calculating status...
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    Aug 6, 2010 9:07 PM (in response to jackinmaine)
    Si señor, a thermal issue caused by micro-fissures in your motherboard solder joints. Here's the hack to fix if that's the case http://www.iphonetiquicia.com/repair-iphone-3g-wifi-oven/

    You reflow your solder joints which reduces resistance which reduces heat and stabilizes your wifi connection. But it's not for the faint of heart.
  • sharathms Calculating status...
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    Aug 7, 2010 12:01 AM (in response to SimpleServe)
    I finally got my iPhone 3GS on iOS4 to connect to my home WiFi hotspot!

    It is indeed related to WPA-2 authentication. After the upgrade to iOS4, I was able to connect to the wifi hotspot at home (the wifi symbol on the top of the screen was connected with 3 bars), but the pages/apps were unable to "connect" to the Internet. I was on 3.1.2 earlier and the iPhone's wifi was using WPA-2 authentication and it was working perfectly fine then.

    I switched my new router to a 4-year old wifi router which was lying unused for a while. This old router has the first gen WPA (WPA-1 if there was ever one). After this, I've got Wifi working back again on my 3GS which has iOS4.

    More notes:
    1. At work, we have WPA-2 Enterprise which works well with 3GS/iOS4.
    2. WEP did not work for me at home with my new router.
    3. Open mode (no authentication/unsecure) did not work for me with the new router.
    4. I tried everything from "Reset network settings", "Forget this network", change WPA2 password, enable WEP, etc, etc. Nothing worked. The phone always used to authenticate successfully with the router, but seems like data transfer was not permitted for some weird reason.

    I guess I'll be using my old router until Apple releases a fix for this problem. I don't think everyone here an old router to spare. So, a lot of people seem to be stuck without wifi after upgrading to iOS4 on a 3GS. Bad!
    iPhone 3GS, iOS 4, Upgraded from 3.1.2 to iOS4 on my 3GS
  • SimpleServe Level 1 Level 1 (0 points)
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    Aug 7, 2010 6:40 AM (in response to KoobcamUser)
    It would be AWESOME if you cooked it.

    But, worst case scenario, you can keep your unlimited data by buying an aftermarket logic board or by buying a used iphone and popping in your sim.

    If you do cook, even temp (no fluctuations) and exact time. Be very gentle while disassembling and assembling your phone.
  • Somniu Calculating status...
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    Aug 7, 2010 6:02 PM (in response to Wrinkly Pea)
    Also having problems with WiFi on my 3GS after upgrading to iOS 4 (now with 4.0.1).

    WiFi is working... and suddenly for no apparent reason the icon disappears from the top left.
    If I have carrier data disabled I can't get on the web (error message comes up saying I'm not connected to the net).

    If I open settings and look at WiFi... it shows me as being connected !!?? (but still no icon on the top left)

    To get back on the network I need to switch WiFi off and on... and sometimes I need to repeat this a couple of times, because as soon as I leave settings the icon on the top left disappears again.

    I've tried WEP and WPA, as well as multiple routers/networks... same thing in all of them. (including my own at home)

    This never happened prior to the iOS 4 update.
    iPhone 3GS, iOS 4
  • D.I. Kempff Level 1 Level 1 (10 points)
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    Aug 8, 2010 11:46 AM (in response to jackinmaine)
    Jackinmine any good news you have on this subject? I have the same problem over here and do not get it working!!!
    iPhone 3GS, iOS 4
  • jsima Calculating status...
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    Aug 9, 2010 9:18 AM (in response to Somniu)
    I had the exact problem Somniu describes above running iOS4.0 on my 3GS. My solution for my home was to give the phone a static IP, and DNS settings. Immediately the Wi-Fi icon appeared, and I was able to connect as normal. Never had this issue with iOS3x.

    Great solution for home, but not great on the road.

    Message was edited by: jsima
    iPhone 3GS, iOS 4
  • SimpleServe Level 1 Level 1 (0 points)
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    Aug 9, 2010 10:59 AM (in response to jsima)
    Good info, jsmima
  • KoobcamUser Level 1 Level 1 (0 points)
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    Aug 9, 2010 1:06 PM (in response to SimpleServe)
    Well I cooked it.....and it WAS awesome!! Keep in mind I bought this iphone 3G second hand so neve had warranty service. The freezer trick worked once but I tried it again this morning and it wasn't cutting it. First I froze for 5min and it worked, next time I froze for 10 but no luck finding anything wifi. Having experience "baking" apple products I decided to give the oven a try. Previously I had baked an ibook video chip and successfully repaired it. I decided I'd definitely need the oven thermometer to get the temp just right. once it was close I popped the logic board in on top of the foil stands like SimpleServe' link showed. A nerve racking 7.5 minutes later I switched the oven off and opened the doors. A long long long 1hr later I pulled the logic board out and started putting the phone back together. After that I booted and was thrilled to at least see the apple logo. As soon as the phone was booted wifi was already on, joined my network and was able to download nice and quick. We'll see if I get the cooler operation and how long the fix lasts. One thing is for sure, I'll be handling the phone a little more carefully from now on. Not that I dropped it or anything, just going to baby it even more I would only do this fix if I had exhausted every other option and was a heavy home wifi user. Not for everyone that's for sure.
    Macbook CD 2ghz, iPhone 3G 16GB, Mac OS X (10.5.8)
  • SimpleServe Level 1 Level 1 (0 points)
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    Aug 9, 2010 8:56 PM (in response to KoobcamUser)
    KoobcamUser, you are AWESOME!!!

    Be careful about using the freezer in the future. Placing a hot phone in a freezer will exacerbate the micro-fissures due to the rapid cooling. Not saying you did it, just saying it for other people to read.

    And I'm glad the oven trick worked for you. It's a great relief to get your wifi back.
  • mugwamp Calculating status...
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    Aug 10, 2010 9:59 AM (in response to Fillipsonn)
    Wow. Cook it. Freeze it. Change all your router settings... I'm kind of sorry I went with an iPhone now. This is all crazy.

    I bought out my Verizon contracts to move over to an iPhone and it was a big mistake.
    3GS 32 gig, iOS 4, Wonky ios4 WiFi
  • KoobcamUser Level 1 Level 1 (0 points)
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    Aug 10, 2010 10:50 AM (in response to SimpleServe)
    Thanks SimpleServe ! Wifi's been running solid so far. I managed to get 7.5 hrs of pretty heavy use, mostly wifi audio streaming. This is significantly more than I'm used to even though I had just changed my phones battery in June. I also think it does run cooler and it probably has to do with the micro-fissures and things heating up because of loose connections or open circuits.
    Macbook CD 2ghz, iPhone 3G 16GB, ipod shuffle 512mb, Mac OS X (10.5.8)
  • adnixon Level 1 Level 1 (140 points)
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    Aug 11, 2010 2:56 PM (in response to SimpleServe)
    Whilst I don't have the problem I took the opportunity to watch the bake my iPhone in the oven video. I guess there will be many that have posted to this forum who will welcome your installment congratulations on sharing the information.
    2 x IBM Core2 Duo 3Ghz Vista + 2 x XP 2 x iPhone 3G OS 3.0 1 x AE 1 x MacMini

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