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iPhone 5 wifi issues

1442700 Views 4,653 Replies Latest reply: Apr 5, 2014 1:09 PM by intuitionist RSS Branched to a new discussion.
  • djfj Level 1 Level 1 (0 points)
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    Sep 27, 2012 10:54 AM (in response to Zmeyerz)

    hey guys. you might want to also check out this post regarding people noticing that their cellular data usage is skyrocketing when on wifi..its all buggy and related

     

    https://discussions.apple.com/thread/4348072

  • Brian43ny Calculating status...
    Currently Being Moderated
    Sep 27, 2012 11:23 AM (in response to tobifs)

    Having same problems.  I reset my network connections under settings.  Relogged and it seems to be working.  

  • John Capra Level 1 Level 1 (10 points)
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    Sep 27, 2012 11:29 AM (in response to djfj)

    Werent there plans to add a wifi+ cellular option to ios6 at some point?  I don't see that option available under cellular but I wonder if there's still some code trying to do that even though the option is disabled in the front end...

  • askarian Calculating status...
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    Sep 27, 2012 11:31 AM (in response to tobifs)

    Same issue with on my 4S (running on iOS6). Wifi drops, inconsistent speed and suddenly dies lol its probably a software bug. I cant connect if to home wifi or the one at our office worked fine on iOS 5

  • Phil Ossifer Level 1 Level 1 (10 points)
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    Sep 27, 2012 11:38 AM (in response to tcaleshu)

    Very interesting. A switch that went away, and something smart to take it's place.

     

    Thanks. I just read a Bufferbloat paper by Jiang regarding Cellular and WIFI networks and it appears the phone engineers are currently using a "hack" to get around the problem by limiting the receive buffers for the cellular side of the phone where the system has massive over buffering which fools TCP-IP into sending more data than it really should into this apparently huge pipe, and when it then does not back off, (because it is being buffered)  it eventually drops entirely after overshooting the mark. At that point it would be "no soup for you".

     

    I would think that strategy would tend to favor the cellular network over the wifi since there's no intervening router and the phone is a captive endpoint that is very busy exchanging differerent kinds of status information back to the system as a device, handing off to different towers, etc. There's no data revenue stream for supporting WIFI.on a phone.

     

    WIFI on the other hand doesn't rely on a similar smart layer for management so I don't know if that hack of limiting the receive buffers somehow got carried over to the WIFI side by the lack of being able to logically  isolate the two, (at least without turning off data plan service for a while).

  • MattFagala Calculating status...
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    Sep 27, 2012 11:39 AM (in response to tobifs)

    Turning off LTE has been the only fix for me. I could connect to WiFi, but it would drop after a few minutes.

  • Kurt Shriner Level 1 Level 1 (0 points)
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    Sep 27, 2012 11:50 AM (in response to MattFagala)

    At first, this solution appeared to work for me.  however, after a minute or two, WIFI access to the internet drops completely, just like before. 

     

    So far, no access to WIFI after 6 days of ownership, two complete DFU's and one complete unit warranty swap.

  • Eric Maier Level 1 Level 1 (45 points)
    Currently Being Moderated
    Sep 27, 2012 1:34 PM (in response to tobifs)

    My won't stay connected unless wireless security is completely turned off (WEP doesn't work either). A hard reset (holding both buttons down 10 sec) will allow it to connect for a little while, but then it stops again. Must be software in my case. Have tried manual DNS, clearing cache, proxy to auto, etc. but none of those worked for me.

  • joe619 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Sep 27, 2012 1:43 PM (in response to tobifs)

    Went to the apple store and had them swap phones.  Get home with the new phone, do my icloud restore....SAME EXACT PROBLEM.  Slow and erratic wifi...

  • bvanlente Calculating status...
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    Sep 27, 2012 1:51 PM (in response to tobifs)

    Guys, its not the phone its IOS6.  I have the iPhone 4 does the same thing, I can "fix it" by turning off the cellular data.  Keep screaming at Apple OR threaten make more noise, just what they need another Antenna Gate.

  • John Capra Level 1 Level 1 (10 points)
    Currently Being Moderated
    Sep 27, 2012 2:03 PM (in response to bvanlente)

    I am now convinced that this is code related to the wifi+cellular option in the IOS6 beta that is being called accidentally.  I just checked my data plan and i have now used 3.3gb of data since i got my iphone 5.  I have NEVER gone over 1GB and have done nothing on cellular that would explain that.  I think the release they went with for IOS 6 gold master is still using pieces of wifi+cellular accidentally and it is causing all kinds of issues with DNS resolution, latency, wifi, etc.

  • Motyoj Level 1 Level 1 (10 points)
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    Sep 27, 2012 2:04 PM (in response to John Capra)
  • drStrangeP0rk Level 1 Level 1 (0 points)
    Currently Being Moderated
    Sep 27, 2012 4:24 PM (in response to Markk70)

    Talk to your ISP or consider your DNS server settings. DNS is not iPhone or iOS related. Clearly your DNS resolve is slow, hence a DNS/ISP issue.

  • joe619 Level 1 Level 1 (0 points)
    Currently Being Moderated
    Sep 27, 2012 4:34 PM (in response to bvanlente)

    I think it's the OS as well, but Apple is forcing us to jump through all of these hoops in order for them to troubleshoot it. 

     

    Also I can NOT fix my problem by turning cellular data off, turning LTE off, using a UN-encrypted network, etc. 

     

    At this point, I'm not even sure what to do...

  • Shanon.Roberts Level 1 Level 1 (5 points)
    Currently Being Moderated
    Sep 27, 2012 4:37 PM (in response to tobifs)

    Go to Settings, General, About

     

     

    Scroll down till you see Modem Firmware

     

     

    Reply Back with your Modem Firmware

     

     

    Modem Firmware: 04.12.02

     

     

     

     

    I have plastered the problem all over Apples Various forums and also logged a BUG Report

     

     

    Go to Settings, General, About

    Scroll down till you see Modem Firmware

    Reply Back with your Modem Firmware

    Modem Firmware: 04.12.02

    IF your Modem Firmware is lower than the above on Iphone 4S, this is why your WiFi isnt authenticating.

     

    The problem is already hitting CNET and other Tech websites.

     

     

    I have 5 staff members of mine personally, all have iphone 4s, all updated to IOS6 and all connecting to my WiFi at the office. Some work and some done.

     

     

    The only difference i have discovered by comparing all these phones is the Modem Firmware difference as per above comment.

     

     

    Some shops over seas have already begun to swap / replace phones, however Australian users at this point dont seem so lucky. Only if you have Iphone 5, you could be fortunate to get a new replacement.

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