Wifi always shuts off after X minutes of sleeping it might have reconnected so fast you didn't notice or you the phone wasn't asleep long enough for it to shut off (I think it is 15 min ). The only exception is if there is no 3G or EDGE (airplane mode?), it may stay on but otherwise it shuts off. If you look in the manual it can give you specifics but it does shut off.

Sent from my iPhone 4B1

On Oct 5, 2010, at 22:16, "Donald" <xlnt74@sbcglobal.net> wrote:

> When I first got my iPhone 4, WiFi stayed on even when it was asleep, my understanding was that was for apps like Skype to be able to get calls while asleep. Are you saying that's not true?
>
> --- In apple-iphone@yahoogroups.com, Bill Boulware <bill.boulware@...> wrote:
>>
>> No, WiFi always shuts off after it goes to sleep to save battery.
>>
>> On Tue, Oct 5, 2010 at 20:45, Donald <xlnt74@...> wrote:
>>
>>> Recently my iPhone 4 iOS4.1 has started to "log off" WiFi when it goes to
>>> sleep. I thought iOS4 was supposed stay logged on all the time. Any ideas?
>>>
>>>
>>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
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