Q: no WI-FI after IOS 5.1

well you need to backup everything separately ... I lost only my text messages, but put back everything else ... It took me a day to do it, but now it's finaly working OK

sorry this didn't work for you ...

just a question, did you set it up as a new phone and then restored last backup from iTunes?

because you need to install it as s completely new iPhone, load contacts from iCloud or Outlook or other, download all purchased apps from iTunes again, load pictures from PC, etc. ... do not use any backups from iTunes or iCloud ...

Like others, I tried all these steps and then gave my phone to my husband, who rarely uses wifi. He set it up as a new phone and still it has no wifi.

same here

Now I've tried to restore a 3GS as a new iPhone and after that restored a backup of another well functioning 4G. Still the same. Tried flymode on, off, on, flymode of, reconnected to wi-fi - still the same.

And it worked all fine before upgrading to ver 5.1.

I have the same problem with my 3GS. Thanks to this problem I am forced to overage charges each month thanks apple  I really do appreciate it. I have noticed for some stupid reason I stumbled upon the fact that when I hold the home button down till it brings up the voice command feature then cancel out of it my phone will find wifi signal for a short period of time.  (Like 30 seconds or a min) I am very frustrated with this problem. I'm quite dissatisfied with how painfully slow the whole device operates since iOS 5.  I can tell you for a fact my next phone will deffinately not be a apple! That new Samsung looks more appealing every day that I have to deal with this junk.

Hey everyone, I posted just over a month ago on this thread. My wi-fi was not connecting at all on my iPhone 4.

I read a few posts before I decided to write my own but it seems like the method that works for me does not work for everyone. Below I am listing exactly what I did:

Settings > General > Reset > Reset Network Settings

This did not require me to restore my phone.

After my phone rebooted itself, the Wi-Fi tab in settings started to recognize networks again. Because the network settings have been reset, all I needed to do was re-enter the password.

My suggestion is to try this first because it at least worked for me. If this does not work I'd say restore and then take it to your apple retailer if restoring did not work.

Good luck everyone.

I understand the frustration.

I can just say that total reset and setup as a new iPhone worked for me, and this was my final try ...

But one interesthing thing. My wife has exactly the same 3GS with 5.0.1. running, and even though my iPhone is working better than before, hers is working much better wih wifi. For instance on home wifi, while iPhone is idle (screen off) 5-10 minutes, when I turn my screen on it takes about 5-10 seconds for my iPhone to pick up wifi, but when I do the same with her iPhone it instantly shows the connection as it is constantly connected in the background.

So there is obvious iOS 5.1 software issue causing hardware failures on iPhones, and not just older models ...

We can all (with minor or larger issues) just hope for fix in new iOS 5.? ...

Dearest Apple

I have the same problem too. At the beginning i thought it was only a matter for the 3GS but i've seen a couple of guys here talking about the 4 too ... Well Dearest Apple you'd Better do something about it QUICKLY,

Yours,

A frustrated with the ios 5.1 customer .

Same problem. Recently purchased a refurbished white 3GS 16GB iPhone through AT&T which required an upgrade to 5.1. After that, it would not pick up my own home network (Macbook Pro and other iPhones used prior and currently have no issues).

Thank you, skrznar, for your suggestion. It seems to be working at home, which is a big help, but when I look at the list of available networks, what should be 10 is only 2. At any rate, I am happy to have it working in my own home! Hope there is a fix for this in the next iOS update.

FYI, I just updated my 3GS to IOS 5.1.1 and it has not improved the wifi problems encounted since IOS 5.1

Strangely, I've been on iOS 5.1 on my 4S since January with no wifi issues whatsoever.  However, today, I went to sync my phone on iTunes and noticed a pop up that a 5.1.1 upgrade was available.  I declined to upgrade, but shortly after, I noticed that my wi-fi wasn't working.  Now, in the Settings menu, Wi-Fi is grayed out and says "No Wi-Fi" next to it, with no option to change anything.  What a hassle.  Not sure what to do now. I checked my settings and I'm still on iOS 5.1, not 5.1.1. 

Same problem...

When my ip4s is iOS5.1, is OK...

But...yesterday I update to 5.1.1....

No WIFI , NO HOTSPOT ....