after upgrade my iPhone 4S to iOS 7.1 I have no Wifi, after wake up from sleep!!

The first basic troubleshooting step for any piece of electronic equipment is to turn it off, then turn it back on again. This is such a common step, that it's become something of a joke, that when you call tech support, that's the first thing they ask you to do, even if you've already done it. Why? Because it fixes 99.99% of all technical problems.

Are you saying that you have to reboot your wi-fi router every day now?

Yes, I am saying that restarting my router does appear to make my iPhone 5 running iOS 7.1 more reliable for a short time even though the other dozen or so wi-fi capable devices are having no problems at all. Oddly enough my iPhone also appears to function better on the wi-fi after I reboot the phone itself and it also connects and stays connected for a while if i disable and reenable wi-fi within iOS. What this tells me is that it is the act of refreshing the wi-fi connection is what helps and not that my router has some problem understanding a mysterious new iOS protocol that exists outside of the IEEE standard I highly suspect this is the case for other users who are claiming that a router reboot "fixes" it.

How many times have you had to reboot your wi-fi router to get your iPhone to work on that wi-fi?

Have the other dozen or so devices recently had some form of operating system or firmware update?

Here's a 'down & dirty' explanation:

Your wi-fi router recognizes your iPhone, and expects it to speak a certain dialect. However, one day your iPhone starts speaking with a different dialect (the new iOS), and while your wi-fi router recognizes the iPhone, it is confused because it's speaking a different dialect than it was expecting.

Computers are stupid. If you don't tell them exactly what to do in a specific situation, they won't work. So, instead of using 'common sense' and saying, "Oh, maybe I just need to refresh myself and listen properly,' the wi-fi router just doesn't connect to the iPhone.

So, if the particular dialect is one that the wi-fi router recognizes, then rebooting it resolves the issue. But, if the wi-fi router doesn't even understand that particular language in the first place, it needs a Rosetta Stone rash course (i.e., update the firmware).

If your iPhone connects to even a single wi-fi router, anywhere at anytime, then the wi-fi function on the device is fine.

My point has been made rather clearly for all perhaps excepting those who are hellbent on defending Apple at all costs. The number of times I've rebooted my router is irrelevant to determining the cause of the problem as is whether or not my other Wi-Fi devices have had recent firmware updates, but if you'd like to try and make something of it it just so happens that I did apply a firmware update to my wi-fi enabled Sony Blu-Ray player about nine days ago and I've been streaming movies from Netflix and Amazon on it like a champ both before and after the update. Now if you don't mind too terribly much, I see little value in continuing an excercise of answering questions posed only to deflect attention from the fact that this very obviously a problem with this release of iOS.

The only "dialects" my iPhone needs to speak are one of the currently accepted and implemented versions of the IEEE 802.11 standard. The version of the operating system is irrelevant. My router doesn't care if it's Windows, iOS, OSx, Linux or some other OS so long as it's speaking using a protocol it understands.

A protocol standard is a contract. It defines what talkers will say and how they will say it so that listeners know what to expect and how to interpret it. Protocols are OS agnostic.

Sorry for the separate replies but you added more to your comment while I was responding. Just to clarfiy the problme with my iPhone is not that it won't connect to Wi-Fi, it's that it won't STAY connected to Wi-Fi. This happens at home, it happens at work, it happened in the Thistle Hotel near Heathrow airport, it happened in the Best Western hotel in London. I'm really not sure why you're trying SOOOOO hard to make this anything other than iOS's fault.

I'm not hellbent on defending Apple. I'm using logic.

Let's review the facts, one more time:

1. Your iPhone would not connect to your wi-fi router.

2. You rebooted your wi-fi router.

3. Your iPhone then connected to your wi-fi router.

Therefore, since a reboot of your wi-fi router resolved your issue, there was a problem with your wi-fi router.

This is simple & basic troubleshooting logic.

If you'd restarted your iPhone and that fixed the issue, then I'd have said there was a problem with your iPhone.

Or, if restoring the device as new resolved the issue, I'd say there was an issue with your user data on the phone.

I use logic when approaching troubleshooting and isolating root causes. Emotionalism doesn't play into it.

My friend, if you were using logic and taking into consideration the totallity of everything I've told you regarding my problem then you would have ceased in this silly endeavor long ago. I'll move along and look for serious solution providers as opposed to one who is plainly more interested in being stubbornly "right" than in solving problems.

Same problem to report with my 4S on iOS 7.1.

Since 7.1, my phone will not hold a wifi signal. I can watch it drop wifi to 3G and (if I'm lucky) back to wifi while sitting here on my couch just a few feet from the router (a Linksys E1200, if it matters). I would just deal with using 3G if my reception at home wasn't terrible... I can almost always demonstrate the problem just by refreshing a page on Safari. Wifi drops while the page loads.

Unfortunately there are no firmware updates for the hardware version of my router, but rebooting the router doesn't resolve the problem either.

Closing all apps and rebooting the phone did not fix it. Reset network settings did not fix it.

I've set up a static IP. No improvement.

Airplane mode does not improve it.

Toggling wifi off/on the phone doesn't help. Usually it will never reconnect on its own (I have to go to Settings and wait for it to scan networks). When I try to enter the wifi section of Settings on the phone, it hangs the app. Then it hangs while searching for networks. Sometimes it doesn't even find anything at all.

I used to watch a lot of YouTube on my phone, but it's impossible now with a constantly changing connection. I've learned my lesson not to upgrade the iOS on any "old model" Apple devices. This isn't my first problem after installing iOS7. Disappointing.

I have exactly the same problems with the wifi. I have 4S and previously there was never a problem. This is the first time. If only there's a way to downgrade...

even i was also have same issue and it just ios 7.1 update on my iphone4s. one thing there is no solution for this issue because it lead to hardware failure. only way to get new iphone4s. i got replacement.

but ios on new set 6.0.1 ios but i have no good feeling to update ios 7.1

Alesandrial wrote:

My friend, if you were using logic and taking into consideration the totallity of everything I've told you regarding my problem then you would have ceased in this silly endeavor long ago. I'll move along and look for serious solution providers as opposed to one who is plainly more interested in being stubbornly "right" than in solving problems.

It's not about 'being right' on my end. It's about providing you with information so you understand your issue.

You reset your wi-fi router, and then you were able to connect to the internet. Is this true, or false?

Edit: Your second to last reply was the FIRST TIME you ever said that this problem occured with more than one wi-fi router.

Additionally, upon further review, it seems like you jumped in on my discussion with someone else (Mtblewis), and I missed that you were a different person.

Your situation might be different, but in a situation where someone reboots their wi-fi router, and that solves the problem, then the router was where the error occured. There's more to wi-fi than just compatible protocols. The devices have to recognize each other properly. If your iPhone 'sees' a wi-fi router, then it recognizes it. But if it won't connect, and by rebooting the router it will then connect, then the problem was in the router.

Mtblewis never responded with additional details. The fact that you are assuming that your situation is identical to his is ridiculous. There are many, many possible root causes for a failure to connect to wi-fi. But once you try a particular troubleshooting step, and the issue resolves... what does logic tell you?

Oh, that's right. You're immune to logic. Must be nice.

I apologize for jumping in and confusing you, I should have made it clear that I was not the OP, but given the similarities between the OP's situation and mine I took issue with your analysis and chose to respond. The tone of your reply to the OP, whether you intended it or not, comes off as condescending. Furthermore, there plainly IS NOT enough information provided by the OP to state in no uncertain terms such as you did that his router is without a doubt the problem.

I confess that your air of superiority coupled with your later professorial attempts to simplify and break things down for me as if I'm a technical illiterate irritated me -- especially taken in light of the fact that you apparently know very little about the concept of industry standardization and protocols in that you believe that different OS versions speak different "dialects." If you're going to stomp about proclaiming that there is no other possible cause for someone's problem then perhaps you might make sure you know what the heck you're talking about in the first place. You were feeding the OP a line of specious techno-babble. An OS either correctly implements a standardized protocol or it does not. It doesn't speak a protocol with a "dialect" or a foreign accent that a router has trouble understanding like you or I might have trouble understanding a representative in an off-shore call center. The fact that the OP very plainly states that only his iOS 7.1 devices are having the problem pretty much shoots your router theory in the foot or at the very least calls it into question to the point that more information from the OP is needed before anyone can state without a doubt what is his problem.

From where I sit it's fairly clear that iOS 7.1 either implements the IEEE 802.11 protocols poorly OR has a problem in its own internal Wi-Fi driver that is making a great many devices unable to maintain a reliable connection. Reestablishing the iOS 7.1 device's Wi-Fi connection by various means appears to help in some cases but rarely does it fix the problem long term for anyone in any online account I've read. In order for you to see this you have to step back from trying to "win" this debate and look at a larger sampling of information from the many people who are complaining about iOS 7 Wi-Fi issues. If you're the technical wiz and logical hotshot that you seem to think you are then I'm pretty sure you can do it.

I want to follow up to my post with something that HELPED but did not solve the problem in my case: downgrading mixed broadcast (B/G/N) on my router to B/G only. The phone still has incredible trouble even detecting ANY networks in my apartment building sometimes, but once I do get it connected, it has held the signal better than it was with N broadcasting. Not sure if it's just a coincidence since the problem is still unresolved.

The signal still drops enough to make YouTube unusable, and it drops when I do multiple network tasks at once such as upgrading an app while also loading sites on Safari.

But give that a try and see if it helps.

So encrypteduser I did noice my phone get hot after the 7.1 upgrade. is there any way to check the wifi chip's status? If 7.1 fried my wifi I in trouble cause I can't get a new one until June.