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Does Wi-Fi turn off when locked

97486 Views 57 Replies Latest reply: Jun 27, 2013 5:58 PM by rphunte42 RSS
  • Kwopau Level 4 Level 4 (1,725 points)
    Currently Being Moderated
    Aug 31, 2010 3:39 PM (in response to cmdred)
    the data connection needs to be on in order to receive voicemail, and to send mms, I'm sure some apps still uses 3G.
    HP Pavilion DV2812tx, HP DV4-1504tx, Windows 7, iPod Hi-Fi, iPhone 4 32 GB Black
  • Debelina Calculating status...
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    Aug 31, 2010 3:49 PM (in response to cmdred)
    I don't know the implications. I did notice that I had to turn it back on in order to use Shazam
    HP, Windows XP
  • compwiz1202 Calculating status...
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    Aug 31, 2010 4:23 PM (in response to Guybrush-Threepwood)
    Yes, I always turn off Cellular data before I go to bed so it doesn't use all kinds of data on my cellular data usage. I think that can definitely make the difference for some people being able to keep under 200MB in a month.
    DELL STUDIO XPS 1640, Windows 7
  • iDarshan Calculating status...
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    Nov 30, 2010 10:11 PM (in response to Iskor12)
    Hi Iskor12, I tried what you suggested. What I am doing in my sample application is I an sending a UDP packet every 6 minutes and then going to sleep using usleep function of C. In this scenario my device is not listed in the router's connection list after some time around 5 to 6 minutes but still my UDP packets are going. That is it is still having connection to wifi router, otherwise how the iPhone can send the UDP packet. I checked the packets on wireshark on the host on which my iPhone is sending the packets. So I am not getting the perfect answer, whether iPhone turns off wifi after some time or not.
    iPhone, iPhone OS 3.1.3
  • Odonadon Calculating status...
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    Dec 27, 2010 7:50 PM (in response to Guybrush-Threepwood)
    Beautiful! After an hour of Googling this solved my problem. I didn't realise a data connection was needed for certain functions of the phone (MMS, etc.) so I disabled it thinking it would save battery life. Turns out it did the opposite as WiFi continued to stay connected even when it went to sleep.

    Thanks!
    OD

    Guybrush-Threepwood wrote:
    In 4.0 and 4.0.1 the wifi was persistent on the iphone.

    In 4.0.2 they changed it to disconnect after being in sleep for 10 seconds.

    However, if your data connection is turned off in the settings the wifi will remain on when in sleep.

    This was confirmed by a member of Applecare.
    MacBook 13", Mac OS X (10.5.8)
  • Ghostrider501 Calculating status...
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    Mar 2, 2011 2:11 AM (in response to TechFrenzy)
    wifi stays connected on the iPhone 4 when in sleep mode.

    On my iphone4. Wifi switched off, 10hours later, mostly sleep mode, maybe 2or3 text sent, battery was down from 100% to 90%


    Wifi switched on, 2hours later, in sleep mode it went from 90% to 79%

    So for me, it stay on, which I find is very wrong and a major battery drain.
    27"iMac, Mac OS X (10.6.6)
  • Issachar Calculating status...
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    Mar 28, 2011 11:13 AM (in response to TechFrenzy)
    I usually have data turned off when I use wifi and I didnt notice any wifi disconnect. I actually just did a test to keep ping my iphone for over 30 mins my iphone still response to the ping.
    Mac mini MB463LL/A, Mac OS X (10.5.6)
  • Gordon Buchanan Calculating status...
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    Jun 5, 2011 9:08 AM (in response to TechFrenzy)

    What I notice on my iPhone 4 is that wifi is off when the screen is locked. If I try to facetime to my phone from my wife's ipod touch, then my iPhone doesn't ring at all unless I wake it and the screen is on. I think that this is a problem. If I try the other way and facetime from the phone to the touch, that works fine. When the touch screen is off the touch still "rings".

  • erijkgabriel Calculating status...
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    Jun 10, 2011 12:43 AM (in response to TechFrenzy)

    I had a battery draining problem after i had add another e-mail account so i'd put fetching off, but it deedn't seem to put off wifi at first on lock. only after i'd seen there's an advanced option that goes with fetch new data the problem was solved

     

     

    if you'd like to save battery, and auto turn wifi off when locked:

    (BTW) I'm running ios 4.2.1 on ipod touch 2g, couldn't tell about whether this works on iphone

     

     

    Settings --> Mail, Contacts, Calendars --> Fetch New Data

     

    turn Push Off --> set Fetch to manually (applications will go through fetching data only when opened or manually updated, NOT on a timely basis)

     

    scroll down and press Advanced

     

    (make sure all accounts are set to Manual, if one is on Fetch, Wifi will be ON all the time and drain your battery anyway)

    iPod touch, iOS 4.2
  • CassetteWalkman Calculating status...
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    Nov 23, 2011 1:31 AM (in response to erijkgabriel)

    Brilliant! Thanks erijkgabriel. Clicking through to the Advanced screen reveals the culprit. No matter that you have Push "Off" and that you have Fetch "Ticked" as Manual, while any mail account is set to "Fetch" status it will force the phone to attempt to keep a connection active even while in sleep. (That is, if Data is Off, and have wifi switched to On.) Seems like an OS error to me. Setting Fetch to Manual should disable any associated tasks within the phone.

  • luis144 Calculating status...
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    Dec 27, 2011 8:24 AM (in response to CassetteWalkman)

    I have an iPhone 4S with iOS 5.0.1, and need to keep 3G off to save battery, so I keep my wifi on.

    I've been doing a simple ping and realized that is not persistent, but it also wont stay off al the time.

     

    The behavior is very random:

     

    With the phone active Wifi is active (obvious)

    When locked it maintains the wifi active for 20 secs

    Wifi goes off for 20 secs

    Wifi goes on for 20 secs

    Wifi goes off for 20 secs

    Wifi goes on for 20 secs

    and keeps repeating that behavior...

    Sometimes the cicles are longer or shorter than 20 secs, I've seen 5 secs cicles and 1 minute cicles, I really would like to know what services are waking up the wifi, or what this cicles depend on.

     

    Hope this helps.

  • rphunte42 Level 1 Level 1 (5 points)
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    Mar 3, 2012 10:25 AM (in response to luis144)

    luis144 wrote:

     

    I have an iPhone 4S with iOS 5.0.1, and need to keep 3G off to save battery, so I keep my wifi on.

    I've been doing a simple ping and realized that is not persistent, but it also wont stay off al the time.

     

    The behavior is very random:

     

    With the phone active Wifi is active (obvious)

    When locked it maintains the wifi active for 20 secs

    Wifi goes off for 20 secs

    Wifi goes on for 20 secs

    Wifi goes off for 20 secs

    Wifi goes on for 20 secs

    and keeps repeating that behavior...

    Sometimes the cicles are longer or shorter than 20 secs, I've seen 5 secs cicles and 1 minute cicles, I really would like to know what services are waking up the wifi, or what this cicles depend on.

     

    Hope this helps.

    That does not match my testing.  I can monitor my wireless router activity on my laptop, and the IP used by my iPhone 4S goes inactive after 10-20 seconds after putting it in locked mode, and doesn't come back on until the phone is unlocked.  This is a problem because any activity that needs to take place will then go to 3G, running up the data usage.  It appears that the phone contacts someone twice a day and transmits something, on the order of up to 3MB each time.  Assuming maximum transmissions twice a day for 31 days, I would be using up to 186 meg/month!  Now I have an unlimited data plan, but my wife, and her sister are on my bill, and they have only 200MB data plans.  I am quite curious what is being sent, and to whom, since I have all the 'system services' things turned OFF, and also diagnostics and data off.  I am sure ATT loves this!

    Running IOS 5.01.

  • rphunte42 Level 1 Level 1 (5 points)
    Currently Being Moderated
    Mar 3, 2012 10:29 AM (in response to erijkgabriel)

    erijkgabriel wrote:

     

    I had a battery draining problem after i had add another e-mail account so i'd put fetching off, but it deedn't seem to put off wifi at first on lock. only after i'd seen there's an advanced option that goes with fetch new data the problem was solved

     

     

    if you'd like to save battery, and auto turn wifi off when locked:

    (BTW) I'm running ios 4.2.1 on ipod touch 2g, couldn't tell about whether this works on iphone

     

     

    Settings --> Mail, Contacts, Calendars --> Fetch New Data

     

    turn Push Off --> set Fetch to manually (applications will go through fetching data only when opened or manually updated, NOT on a timely basis)

     

    scroll down and press Advanced

     

    (make sure all accounts are set to Manual, if one is on Fetch, Wifi will be ON all the time and drain your battery anyway)

    I had calendars set to fetch, but wi-fi was going off anyway.  iPhone 4S with IOS 5.01.  Turned fetch off anyway.

  • rphunte42 Level 1 Level 1 (5 points)
    Currently Being Moderated
    Mar 3, 2012 10:31 AM (in response to Ghostrider501)

    Ghostrider501 wrote:

     

    wifi stays connected on the iPhone 4 when in sleep mode.

    On my iphone4. Wifi switched off, 10hours later, mostly sleep mode, maybe 2or3 text sent, battery was down from 100% to 90%


    Wifi switched on, 2hours later, in sleep mode it went from 90% to 79%

    So for me, it stay on, which I find is very wrong and a major battery drain.

    How are you determining that wi-fi is actually active?

  • dconrey1208 Calculating status...
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    Jun 8, 2012 6:24 AM (in response to TechFrenzy)

    this is true for all apple products all iphones ipods and ipads but for iphones if you are somewhere where you know you have a good wi-fi connection you can go into your settings and turn off cellular data and it will stay connected to wi-fi even when it goes into sleep mode but remember when you leave the wi-fi spot you will have to go back into settings and turn cellular data back on because it wont do it automatically

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