No iPhone Wi-Fi After iOS 4.0 Update; Fix

A few users have reported loss of iPhone Wi-Fi connectivity after the update to iOS 4.0. In these cases, the Wi-Fi option in the iPhone’s Settings app may be grayed out.

Potential fixes

Turn router off then on Try turning your wireless router off then back on.

Change or turn off wireless security You may want to try toggling the settings on your wireless router, switching from WPA to WEP or vice versa, or, as a last resort, turning wireless security off altogether. For AirPort routers, this can be accomplished with the AirPort Admin Utility. For other routers, this can usually be accomplished by accessing the router’s configuration page — open a browser and enter the address 192.168.1.1.

Reset network settings on iPhone. On your iPhone, open Settings, then navigate to “General” in the left-hand pane. Scroll down and tap Reset, then select “Reset Network Settings.” This will delete any stored WiFi passwords and other information, but may result in a more stable connection.

Restore, but not from a backup. One less-than-ideal fix for this issue involves restoring the iPhone as a new device rather than from a backup. It appears that bad holdover data from iPhone backups can cause loss of data access. Restoring as a new phone will delete contacts and other data, but generally resolves this problem.

To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”

Comments

  1. says

    Same thing happened to me when I upgraded from 3.1.2 to 4.0.1. iPhone 3G 16 GB
    at first it was working. after jailbreaking and unlocking it also worked. but later something happened, and now it scans, but finds no wireless, even if it is next to the router. freezer solution doesn’t help too.. no wireless signal at all. Apple must publish a patch for this. Because I don’t have any warranty. what will I do with a no-wifi iphone..it is rubbish..

    • Abouzar says

      hey guys i have the same problem with my iphone its surching but no rezultes comese up i tried the freezing and also heating ways to salve the problem but i didnt got any rezultes for this plz guys if any one have the solution for this soo plz tell send to my email

  2. says

    FREEZER SOLUTION!!!! AMAZING!!!!

    After Tech Support tried everything with me I just decided to try the Freezer Solution. It made absolutely no sense to me and no one has been able to explain why it works but IT WORKS!

    I turned off the phone and put it in the freezer for 8 minutes. Turned on the phone and connected via Settings/WiFi and BAM… first connection since installing iOS 4.0!!!! It has auto-connected every since!

    Amazing!

  3. says

    KirkC: Are you being legit? That doesn’t make any sense and I can’t risk not having a phone. Can anyone else back up this claim? Is it worth checking out?

    KirkC said at 7:21 AM on July 28th, 2010:

    FREEZER SOLUTION!!!! AMAZING!!!!

    After Tech Support tried everything with me I just decided to try the Freezer Solution. It made absolutely no sense to me and no one has been able to explain why it works but IT WORKS!

    I turned off the phone and put it in the freezer for 8 minutes. Turned on the phone and connected via Settings/WiFi and BAM… first connection since installing iOS 4.0!!!! It has auto-connected every since!

    Amazing!

  4. says

    After restoring and jailbreaking my 3g iOS 4.0.1 my phone recognized my wifi but wouldnt connect. Reset the network settings and I’m back in.

    • bruno says

      hi i have a 3gs and ive having the same problem
      since i didint want to fix i just use it as ipod cos i got a iphone for dayli use.
      last nigth i fogete the 3gs inside the car
      since i live in norway the temperature outside was about 5 +
      when i wake up in the morning went out pick up my phone
      there were no juice so i charged it them for some reason open up setings and boom my wifi was not grayed out anymore .
      so yes the freeze migth work i just dunno if it is just temporaly

  5. says

    A-Ha! I found a solution. It worked for me in any case. (nothing else mentioned anywhere had worked …)
    I called Apple who were to kind as to assist me despite my phone being out of warranty, but because it was an operating system problem/upgrade, they were more than helpful.
    They were also completely unaware of the lost wifi issue, but… a solution:
    update your router firmware. Apparently the IP address that the iphone is connected to is not working, and … well, I don’t understand the rest.
    I called my ISP and they updated and now wifi is working fine. Hooray!
    I was just about to shed my Apple loyalty. They’ve almost won me back. (not completely though, I lost a shit load of info: sms, photos, music, call history).

  6. says

    I too thought that this freezer idea was insane. Bought this new iphone 3g 4 months ago and wireless hasn’t been working since. Read about this freezer idea and decided to give it a go. WIRELESS WORKS AGAIN! Its something to do with the iphone, so everyone with this wireless problem should give it a shot. Btw, i’ve also updated to the latest 4.0 software and its working fine for now.

  7. says

    I had the same problem, my ipod would not connect to my wifi after updating to 4.0. I fixed it by changing the router Network Mode to mixed, previously it was on wireless N.

  8. says

    I have iPhone 3. Since upgrading to iOs4: no WiFi. I tried everything I found on the web. Today, I thought “what the heck, I put it in a plastic bag in the freezer for 8 minutes”.
    KAPAHM:: WIFI IS WORKING
    Happy, very happy

  9. says

    It’s crazy, my iphone 3g 8gb has the wifi problem and nothing worked for me, and then i saw a message above to put it in the freezer and it worked, but only for a few minutes, when the iphone is cold it works but when it starts to worm up the wifi problem returns. APPLE SUXXS!!!

  10. says

    Room temp iphone + freezer + 8 minutes = condensation and/or contraction and/or decreased resistance.

    Electricity likes all of the above.

    My theory loose connection.

    It works until the phone warms up.

    Very upsetting.

  11. says

    None of these work for my iPhone 3G. I have updated to 4.0.2 and it still doesn’t work. I have tried all the resetting crap to no avail. It has nothing to do with the wireless equipment in use. It is the iPhone. People seem to over think or not think at all when suggesting solutions. Kel D is attempting to sound like he knows something, when he just makes himself look like a complete freaking anus. Please don’t try to explain IP addressing as the issue with the iPhone. Your “self generated” “predefined” IP address of 169.254.x.x is a freaking APIPA address you tard. That means the iPhone is not pulling an IP from the DHCP server (DORA) so it is falling back on a non-routable IP so it won’t conflict with the network. Then he goes onto talk about Boot P?? Really? Well I guess his iPhone would be considered a dumb terminal. Anyway I hope Cr-Apple will fix this issue soon, otherwise we will be subjected to 50 more websites who copy someone’s supposed fix that doesn’t work. At least verify the fix works before trying to take credit for something that doesn’t.

  12. says

    I just updated to the 4.0 on my 3gs but when i went to work it would not read the wireless available. There are many wireless but the free one where i work at doesn’t seem to work. I tried to downgrade to 3.1.3 and it works again so i thought tat was weird and updated it back to 4.0. What i found out is this…if you go in the specific wireless connection and turn Auto-Login off, you can connect to certain one. Well tat works for me hope someone has the same issue

  13. says

    It SUCKS to have a useless wireless-less iPhone.
    My iPhone 3G is able to see networks but can’t connect to any of it.
    Referring to post 36 about the wifi chip being fried, as my 3G is able to list networks,
    does it mean my 3G is having a software problem or hardware?
    Steve, if you’re reading this.
    PLEASE DO SOMETHING!!!!!!!!!!!!!!!!!!!!!!!

  14. says

    OK SO HERE IT IS…. I WISH I CAN MAKE YOU GUYS PAY FOR DIS…. LOL

    GO TO SETTINGS GO TO AIRPLANE MODE TURN IT ON WHEN IT IS ON IT TURNS OFF WIFI THEM CLICK WIFI AND TURN IT ON…. IT SHOULD PICK THE WIFI SIGNAL YOU ARE TRYING TO CONNECT TO… IF IT HAS A PASSWORD ENTER IT … AFTER THAT YOU SHOULD BE CONNECTED TO THE INTERNET…
    BOUGHT A IPHONE 3G YESTERDAY…. DUDE JAIL BROKE IT BUT DIDNT DO IT RIGHT WHICH MESSED UP EVERYTHING… I DIDNT EVEN HAVE A DIALER…. SO I HAD TO DO HELLA RESEARCH TO FIND OUT HOW TO UNJAIL BREAK IT THEN AFTER THAT WAS DONE I HAD TO FIND A WAY TO CONNECT TO THE INTERNET BECAUSE FOR SUM REASON IT JUST WASNT WORKING!!! AFTER THINKIN BOUT IT REALY HARD AND DOIN SUM RESEARCH I WAS LIKE DUHHHH CUZ THINK ABOUT IT WHEN U GO ON AN AIRPLANE AND U DONT WANT PPL BITING OFF UR WIFI SIGNAL U TURN AIRPLANE MODE ON … OK EVERY ONE I REALLLLLY HOPED THAT HELPED YALL CUZ IT DID ME.. I SWEAR I WAS JUST ABOUT TO GIVE UP AND SLEEP ON IT ANOTHER DAY!!

  15. says

    Apple will not admit this is a software problem. Actually they won’t admit it’s actually happening to 3G’s at all. Post about it on their discussion boards and get flamed by fanboys who tow the company line.

    My fix was to go get an Android phone, bam wifi worked perfectly.

  16. says

    I recently upgraded my ipod touch os 3.1.3 to OS 4.0.2. I had trouble with my wifi. it recognized there was a wifi hotspot but couldn’t connect. I renewed the lease then reset only the network settings. Now working fine

  17. says

    Hi Guy,s
    I also have the same problem no wi-fi or 3G network . screen gives the mesage no data communication possible ( but the in dutch because i,am from the netherlands ).
    *I had OS 4.1 on the phone
    *the strange thing is that there is a page missing were you can change the APN Settings .
    T-Mobile shows in there trouble shooting list a picture and there i see the page.
    *so i downgraded the phone to 3.13
    *result still no wi-fi and no page how to set the APN .
    * so i restored the os 4.1 again
    * tried some freezer tricks and indeed the wi-fi signal was back , :-( but unfortunatly only for a split second or 5 .
    *Then i tried to switch on the flight mode and than switch on the wi-fi and gues what ! it works but :-( again for 5 seconds, not enough time to go to the http://www.unlockit.co.nz site to change the APN problems.
    **** So Conclusion sofar is that i know can downgrade it in a split second ( 25min :-) thats a plus !! keep positive .
    I also sen a mail to Steve Jobs and Apple Europe they respond an will contact me within 4 day , so i can go on with my daily routines !
    But i won,t give up !

  18. says

    Hoi Guy,s
    Here more news of my search to get the dam I-phone on the Internet by Wi-Fi . on a Dutch site i read a story of a guy who placed his I-Phone for more than an hour in the freezer .
    So i thought what the heck i do the same and see .
    * Gues what , for the first time since the update i got connected on my Wi-Fi :-) .
    * I went to the unlockit site and placed the APN settings again
    *I choosed for my country T-Mobile.nl the rest the programm installed in the main menu a profile ” APN CARRIER SETTINGS ”
    *After 10 minutes on the internet and picking up since centuries my mail on my I-Phone.
    * All this with OS4.1
    * after 15 minutes the signal whas gone again ;-(
    *I switched of my I-Phone but the ice cold bitch won,t connect on Wi-Fi .
    * There is only one option left i gues and that,s moving to Santa on the South pole.

    To be Continued

  19. Honesty says

    You need to delete all the wireless network settings and then put them in all over again. This worked on all our phones, no worries!

  20. shara says

    I have done the reset however its still not loading. I have an Apple sign on the the phone and i think it might be frozen.. HELP I NEED MY PHONE TO WORK

  21. says

    If your iPhone’s wireless card was fried when you updated to IOS4 then you will never get it fixed unless you want to spend at least $200. You either have a fried wireless adapter in you iPhone or your soldered connection has melted. Either way unless you can dismantle the iPhone and do soldering of microscopic parts, then you are out of luck.

    Thanks for supporting Apple. We are also working on the policy where we allow the thief who steals your iPhone to use it and sign up for an AT&T contract. Preliminary results are that if we can prove they stole your phone and there is a police report submitted, we will give the original iPhone owner a $10 off coupon on the purchase of a replacement iPhone. We will also be working with AT&T to get them to give the thief a 50% off coupon of their monthly bill when they sign a 2 year contract with your iPhone.

  22. says

    Pretty great post. I just stumbled upon your blog and wanted to say that I have truly enjoyed browsing your weblog posts. After all I’ll be subscribing in your rss feed and I am hoping you write again very soon!

  23. crApple Tech says

    It is amazing the bad advice people will give.

    Kel D gives some really bad advice as follows:

    =======================================================================
    Issue is the iphone generates is own IP address of 169.254.92.91 with a class b subnet mask of 255.255.0.0.
    There is no DHCP server on our wireless in this range. tested on two seperate networks so it is internal to the iOS.
    Setting a static IP address also does not permit communication with hosts on a subnet. However if i create a range as above I can communicate with other hosts. (Ping response)
    An IP scan of the network identifies only the iphone as host. (YEs a class B scan)
    Also by changing to Boot P it will not accept assignment of IP address.
    ========================================================================

    First a 169.254.x.x is an APIPA address that a device uses when it fails to get an IP from a DHCP server (DORA-not the explorer). Of course you would not have a DHCP server in this range b/c this is a non-routable IP and is used to prevent interfering w/ routable IPs. Setting static IPs does not stop devices from communicating with other devices on the same subnet as long as you use the correct IP info. How does a server communicate with clients when clients usually use dynamic IPs and 99.999% of servers use a static IP. The majority of network scanning software would report your iPhone as a host b/c that is exactly what it is, a host. Why would you change to BootP when you are using a DHCP server. Do you have a BootP server and do you realize the reason it is called “Boot”P is b/c it only gets an IP when the device is in the process of booting? In other words did you enable a bootp server and reboot your iPhone just to watch it fail again or did you really expect 2 completely different protocols to magically work together?

    It is aggravating when people try to be something they obviously are not. It doesn’t take an extremely long time to learn networking. Knowing the 5 classes of subnets is extremely elementary. Port scanning is most prevalent w/ wannabe hackers whereas real networkers occasionally port scan but L2 scans are usually more appropriate in finding hosts. I love VLSM, CIDR, Subnetting and everything networking but I hate when someone misleads people and obviously doesn’t know what they are talking about. I would advise Kel D to learn binary and start doing your IP tinkering from there. Start with subnetting a class c range with /25 thru /30 so that you can learn what subnets allow for how many hosts. Learn to identify the different subnets and learn what a Logical AND is. Of course you need to first learn your basic LAN protocols and then move onto your WAN protocols like ATM, Frame Relay, etc. Then you can move onto telecommunications and data wiring so that when you are in a MDF of a 75 story building and you need to locate a data run or a bl/w or Gr/R voice run.

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