Wifi drops when phone is locked after 10.3.3 update

Wifi drops when phone is locked or goes to idle and reconnect when screen is on.

This happens after the last ios update.


Model :iphone 5.

iPhone 5, iOS 10.3.3

Posted on Jul 31, 2017 4:32 AM

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Posted on Oct 25, 2017 7:49 AM

This is not anecdotal. I have been testing it with every iOS release. Nothing has changed. Here is how to actually test it:

  • On your phone go to Settings/Wi-Fi and tap on the i next to the network name
  • Write down the IP address
  • On your computer open a Terminal window (Mac) or CMD window (Windows)
  • Enter "ping <the IP address you wrote down>" (Mac) or "ping /t <the IP address you wrote down>" (Windows)
  • Note the phone responding to the ping command
  • Press the SLEEP button
  • Watch as the responses stop after about 30 seconds
  • To stop the pings enter <CTRL>+C.

Every time a major version is released I do this again. The response has never changed in 10 years.


Repeat the test with the phone plugged in; it won't go to sleep. It may wake up for a few seconds if the phone receives a notification such as a Push email alert, which is an external stimulus, but apps that originate communications will not wake it and will use cellular data.

263 replies

Sep 22, 2017 4:55 PM in response to Lawrence Finch

"However, it will NOT reconnect if an app on the phone attempts to use data; the app will use cellular data..." ~ how is that a feature and not a bug?


If I'm somewhere with robust WiFi and the phone is asleep and as a result WiFi is "asleep," and an app attempts to use data...it will use data instead of WiFi?! How is using data when WiFi is available a feature and not a bug?


I shudder to think that apps that I allow to use data when I don't have WiFi available will be using data even when WiFi is available, solely because the phone went to sleep. Unless I'm missing something (a distinct possibility), that cannot possible be viewed as a feature.

Sep 23, 2017 5:24 AM in response to Philly_Phan

Nice nothing-burger comment. How about you try again, and this time, instead of snark try rebutting the actual point I made, the crux of which was:


If in fact iOS was deliberately designed such that when a device is asleep WiFi "will NOT reconnect if an app on the phone attempts to use data; the app will use cellular data...", then that is a boneheaded design. It is a boneheaded design to require the use of data when WiFi is readily available.


For your benefit I'll clarify that "boneheaded" isn't a technical anatomical or archaeological term, just as my use of "bug" is understood by everyone but the most pedantic among us to mean "a poorly designed element that folks attempt to justify as helpful or useful, but usually not very persuasively."


For someone who wrote earlier, "Two. Wow! Out of two hundred million. Gee that's really a trend.", your "In ten years, Apple has not address your 'bug.'" is pretty hypocritical and an intellectually dishonest appeal to authority. Just because they haven't addressed it doesn't mean it doesn't exist. Because otherwise, by your reasoning (sic), Apple's iOS must be perfect, if this situation hasn't been addressed in 10 years. Well if iOS was perfect to begin with and has been perfect ever since...why are we up to its 11th generation? What about all the issues about which you could've said six months ago, regarding iOS 10, "in nine years Apple has not addressed those issues so they're not 'bugs'"...and then voila!, iOS 11 fixed them.


You're not very good at snark or logic, so maybe you should limit your comments here to technical matters. Of course, that assumes...well, y'know.

Oct 15, 2017 12:14 PM in response to Lawrence Finch

************************** My iPhone 7 just started doing the same thing with in the last few days. Now I use only WiFi no data what’s so ever. Phone is even suspended as I’m traveling to different countries. So no data what’s so ever, airplane mode, 100% WiFi as of a few weeks ago I would get messages and emails when phone was locked or asleep, now it does not. Even using the phone (phone call) the phone locks and drops the WiFi. I can have a phone call go longer then 10 mins with out dropping the call. As before I would talk hours and be just fine. *********************
<Edited by Host>

Oct 15, 2017 12:31 PM in response to ChrisJ4203

Ok you are not smart stop saying it has always done this. It has started doing this a week ago. Do you not read and not understand. I would have 60min phone call with my wife prior to the update , to phone would lock and no issues. Now after the update when my phone locks it drops the call. So I know it’s hard for you to understand but it has not always done this. Thanks for no help.

Oct 15, 2017 12:39 PM in response to Crazzykid

What kind of phone call are you participating in? If this is some type of wi-fi call, then as long as their is data passing through, then the phone will remain connected. The phone will not lock if data is passing. Your device while on a phone call should just darken the screen. What kind of wi-fi are you using?


I just provided you with information about the device, and how it handles wi-fi, not how it handles wi-fi phone calls. I suggest that since wi-fi calls are handled by your carrier, you discuss this with them. Unless you are using some type of wi-fi app to handle these calls, which could have changed the way they handle things in the latest version of iOS. The standards of wi-fi suspending when the phone is locked and no using data is correct, as you have been told. Again, you are doing something else, and have really only provided minimal information except that you are making a phone call and it drops after 10 minutes.

Oct 15, 2017 1:03 PM in response to ChrisJ4203

I’m trying to get it fixed but the service and the people here kept saying your wrong. As I stated before, my phone is suspended and on airplane mode. 100% no data only WiFi. Means no carrier service. Yes I use a WiFi app to make calls and text messages, both of which have been doing fine no issues with receiving calls or text messages or email for that matter prior to last weeks update. I have doing this for 3 months now no issues. That’s how I know it’s changed. Now before I would talk on the phone using WiFi data talking on the phone close and lock the phone and continue to talk yes. Now if it closes or locks it drops the WiFi and the call. Please don’t tell me this has been happing for 10years. I have already reset the network settings and that works for 2 hours or so I do not have the low battery turned on. The ping thing did not work. Any other ideas?

Oct 15, 2017 1:20 PM in response to ChrisJ4203

I could be possible it’s an app issue yes but the WiFi signal dissapearse telling me it’s a phone connecting issue. I have not tried having it plugged in first but the issue is I’m not getting text messages, calls or email alerts anymore. So more then one service having same issue. I hear you when you say it is made that way but not every phone works likes it’s supposed to.

Oct 15, 2017 1:46 PM in response to Crazzykid

Crazzykid wrote:


Ok well thank for nothing then

Look. Despite your original attitude about this entire thing, I spent a great deal of time here trying to get you to understand what was going on and how to follow-up on fixing things. Just because you don't like an answer does not make it wrong, and if you do not wish to follow-up with this app developer about your wi-fi calling, then that is your issue, not ours, and believe me, you got plenty of help here, so your statement about nothing is not true.

Oct 15, 2017 2:00 PM in response to ChrisJ4203

And I appreciate the time you took explaining over and over how it is supposed to work. I don’t appreciate you not taking the time to listen what I am saying about how the device is working. But I guess you think it is working how it’s supposed to now. I know I have a bad attitude but it’s because the product is not working like it used to. But that’s why they have different phone makers. Let me know if they decide to make it a users choice if they want to drain there battery and stay connected.

Oct 25, 2017 7:29 AM in response to Lawrence Finch

Your first 3 sentences may very well be correct, but your final sentence - the snarky one - is a non sequitur. It does not follow that because you have been answering this comment for 10 years, your answer is correct. You could have been spending the past 10 years answering it incorrectly.


There are legitimate reasons for you to actually know that your answer is correct - maybe you designed the iPhone, maybe you attended Apple conventions where it was discussed at length, whatever - but merely spending 10 years answering this comment isn't one of them.


FWIW, and this is just anecdotal, I've just tested your 30-second claim on my iPhone 6 running iOS 11.0.3. When my phone goes idle and I wake it up in less than 30 seconds, the 4G icon rather than the WiFi icon appears in the upper-left corner of my screen, and it takes anywhere from 3-6 seconds for the WiFi icon to appear. Same thing happens when I wake it when it's been idle for 30 seconds or more. Regardless of how long or short the phone's been idle, WiFi shows as disconnected briefly (for 3-6 seconds) when I wake it.


Now, I haven't been testing my phone for 10 years...but I tested it repeatedly just now, and my result is the same as HannanT's result. Maybe the icons are giving false readings. But if so, that's a whole 'nother matter.

Oct 25, 2017 10:50 AM in response to dittoheadadt

dittoheadadt wrote:



If the phone is showing the cellular icon for 3-6 seconds when it's actually still connected to WiFi, isn't *that* a flaw in the operating system?

How do you know it is showing the cellular icon when it is still connected to Wi-Fi? I thought you said the phone was locked; you have no way of knowing what it is showing until you unlock it. And then you have no way of knowing when Wi-Fi reconnects; it isn't going to be instantaneous, as Wi-Fi connections must re-establish a handshake, as it is a synchronous protocol. And displaying an icon is a separate process from connecting. You are truly grasping at straws now, and I see no point in continuing this conversation. Continue on if you wish.

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Wifi drops when phone is locked after 10.3.3 update

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