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iPhone 4 dropping Wi-Fi spontaneously

12334 Views 20 Replies Latest reply: Nov 4, 2010 3:17 PM by jaandrade3rd RSS
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TennisGuy007 Level 1 Level 1 (0 points)
Currently Being Moderated
Jul 15, 2010 4:24 PM
There are times when my iPhone 4 will switch from WiFi to 3G, both at home and work, for no apparent reason. I haven't moved away from the Wi-Fi network and the WiFi network has continued to be operating during these short drops in WiFi connection. Has anyone else experienced this? Any idea why it is happening or how to fix it?
iPhone 4, iOS 4
  • wjosten Level 10 Level 10 (91,460 points)
    Currently Being Moderated
    Jul 15, 2010 4:30 PM (in response to TennisGuy007)
    More info needed...by design, to save battery, the iphone will turn WiFi off when entering sleep mode & switch to the cellular data network. Is your phone dropping WiFi while in sleep mode?
    MacBook Pro
  • softballfreakmom Calculating status...
    Currently Being Moderated
    Jul 15, 2010 6:43 PM (in response to TennisGuy007)
    My iPhone 3G is doing the same exact thing. It looses the wi-fi every five minutes. It, always comes up either saying, incorrect password, or just asking me to join it all together.

    It, never did that while I was living with my parents and now since I've moved it's happens all the time.

    Sometimes I can hit cancel and hit our network name and it connects that way, but other times I have to re-enter the password to get it to log back on to the wi-fi.

    It is really frustrating me.

    I reset my network settings but that doesn't help.

    Help please
    iPhone 3G, iOS 4
  • That1GuyUKnow Calculating status...
    Currently Being Moderated
    Jul 15, 2010 8:53 PM (in response to TennisGuy007)
    Are your house phones cordless? Are they 2.4 GHz? Many cordless telephones work on the exact same frequency as wifi.

    I used to have an issue where whenever my landline cordless phone would ring, my wifi would drop on all the devices in the house.

    1. http://support.apple.com/kb/TS1398
    2. http://support.apple.com/kb/HT1296
    3. http://support.apple.com/kb/HT3828
  • Busta999 Calculating status...
    Currently Being Moderated
    Jul 21, 2010 8:40 AM (in response to TennisGuy007)
    I have been having some issues with the iPhone 4 and Wifi on my home systems.

    My Orange 2G connection (don't get 3G here at all) is weak and the phone drops from 5 bars (IOS 4.0.1.) to Searching with depressing ease, somewhat reduced now I am keeping it in a case.

    When my iPhone 4 goes to 'sleep' for 5 mins or more and is woken up it does not re-establish a wifi connection for up to 4 minutes. Checking Settings Wifi shows it is connected to the router at full strength signal. (not surprising considering the router is 2ft away from it). The connection details revealed it had no IP address DNS Gateway etc etc.

    The router is a Draytek Vigor 2820Vn.

    The problem could also be repeated on a TC with all the latest updates.

    After, many many hours of diagnosis with Apple then Orange and then back to Apple it was decided to swap the phone out.

    I am still seeing the same problem, need to do more testing to determine if it is consistent.

    I'll update in a couple of days.

    The best is was doing was re-connect
    iMac 2 & 2.66GHz * 2x MBPs * 2 x iPhone 3G * TC 1TB, Mac OS X (10.6.4), Thecus NASLite Win7 FreeNAS 'LiteOn Netplayers' Soundbridge
  • stand4something Calculating status...
    Currently Being Moderated
    Jul 21, 2010 11:11 AM (in response to Busta999)
    My wifi does this constantly at home and at work. It says connected but i cant access anything online, i can go to settings and kill the wifi and reconnect and it works everytime within a few seconds, dont know why it goes to sleep or whatever it is doing but its annoying for sure.Note that i can be on the phone or have used the pone within a minute or two when this is happening so it reallyshouldnt be in "sleep" node.
    iphone4, iOS 4
  • riverjake Calculating status...
    Currently Being Moderated
    Jul 21, 2010 2:58 PM (in response to TennisGuy007)
    Having same problem...did not have this problem with the 3GS and it's very annoying...
    PC, iOS 4, iPhone 4
  • CB_CB Calculating status...
    Currently Being Moderated
    Jul 21, 2010 5:04 PM (in response to TennisGuy007)
    Try this:

    in Settings, tap on "Forget this Network". Then add it again and put in password if network requires it.

    This has worked for me so far. Turned off Wi-Fi. Phone went to 3G. Turned Wi-Fi on and it saw my network and did not require password again.
    iPhone 4, iOS 4
  • Busta999 Level 1 Level 1 (55 points)
    Currently Being Moderated
    Jul 22, 2010 12:50 AM (in response to CB_CB)
    "Forget this network" doesn't have any real effect.

    Neither does "Reset Network Settings"

    Neither does "Restore to Factory"

    Neither does "Replace iPhone"

    Tried them all.

    Having said that I tried setting the DHCP server to Bind iPhone MAC address to an IP address seems to have reduced occurrence of the problem, still testing.
    iMac 2 & 2.66GHz * 2x MBPs * 2 x iPhone 3G * TC 1TB, Mac OS X (10.6.3), Thecus NASLite Win7 FreeNAS 'LiteOn Netplayers' Soundbridge
  • HBarry Calculating status...
    Currently Being Moderated
    Jul 22, 2010 4:27 AM (in response to Busta999)
    Glad to see others have this problem. Issue I have is when iphone 4 charging at night close to the wifi, it seems to be fine. Yet as soon as I take it out of sleep and walk around the house, I get data charges. Either it's loosing the wifi connection, or AT&T is bypassing it and sending data directly to the phone. Arrived at our house in Maine yesterday afternoon. TURNED OFF DATA CONNECTION, AND HAVE NOT GOT DATA BILLS SINCE. Wifi works perfectly, I have checked my computer, and have received all my e-mail messages. I'd be interested what happens in your case if you turn data connection off in your home. I will test this as well when I return to Boston.
    Iphone 4, iOS 4
  • mcaro113 Calculating status...
    Currently Being Moderated
    Jul 28, 2010 1:04 PM (in response to HBarry)
    I have the iPhone 4 and upgraded to 4.0.1, while my wife has the iPhone 4 but has not upgraded. Never had wifi issues before in our house with the 3G, but now there are spots in the house with no coverage.
    But what makes it weirder is that her phone has no problems picking up wifi in the same place in our house where I get no signal. Holding the phones right next to each other and she has a signal and I don't.
    It's getting a bit annoying, and I have been looking online to see if others have the same issue and this thread is all I've found
    iPhone 4
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