[XyresicPsych]

Anyone else notice this? Been paying attention to it, and when wake up my i4, it re-connects to WiFi.

Try it out and see what results you get.

[big9erfan]

When the iPhone locks/sleeps wifi turns off. This is nothing new.

[XyresicPsych]

Right but when iOS4 was released it introduced persistent wifi, and it worked for me, when I took the iPhone out of sleep it was already in wifi but no longer.

EDIT - confirmed on both Apple's website and a chart on pocket-lint.
Can't post the links as I don't have 10 posts, but I do know for certain it worked on 4.0 and there is proof of it.

[big9erfan]

Ha. I never noticed. I have 4.0 ( not 4.0.1 yet ) and watch my wifi turn off and on with sleep/wake. I wonder if it's a setting somewhere.

[Jellotime91]

That's not true. It introduced this only for iPod touch.

[big9erfan]

According to the Apple knowledge base it is on the iPhone 4, 3GS and iPod 3rd gen. http://support.apple.com/kb/DL1058

[XyresicPsych]

From apple's site -

Persistent WiFi connection to receive push notifications*

Then, at the footnotes,
* Requires iPhone 3GS, iPhone 4, and iPod touch 3rd generation.

As I said, can't post links but if you google "what will you get from ios4", it's the first link, shows persistant wifi on 3GS, 3G, 4, 3/2gen touch.

[sting7k]

Never noticed my iPhone 4 holding wifi when asleep either, had the same behavior as my 3G.

[chobbs1]

This is why I have not yet upgraded. Thanks for posting this

[jakej914]

Persistent wifi is still working for me on my iP4 with 4.0.1

[jakej914]

That's not true. It introduced this only for iPod touch.

Definitely not iPod Touch only. Worked on my 3GS running 4.0 and my iP4.

[macharborguy]

question:

if persistent wifi IS working for you: did you do a clean start, rather than a restore?

if it IS NOT working: did you do a restore from backup, rather than a clean start?

[isuquinndog]

Persistent wifi did not work for me before on iOS 4 and still doesn't after going to 4.0.1. I have a 3GS.

[AGreenGiant]

There no problem on my 3GS for my 4.

Very strange indeed.

[jakej914]

Persistent wifi worked for me on 2 restores from backup, and 1 clean install.

[touchyphone]

I dont think I ever saw it work on 4.0 or 4.0.1 on my iP4....

[bste]

As long as you know you have wi-fi, how about if you have Wi-Fi "on" in the network settings, and turn cell data and 3G "off" in the settings. The phone then can't revert to 3G. You'll have persistent wi-fi, even if it's because of the settings (of course, you'll need to go into your settings and turn cell data and 3G "on" when you want or need them). [Iphone 3G, ios 4.0.1 here]