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I haven't had to plug in either. I can't help but think a few journalists misread or misinterpreted something and that's why all the tech blogs keep saying you have to be plugged in to power.
 
working as designed. wifi sync is supposed to work powered or unpowered.

on the Wi-Fi Sync page it says

"Automatically sync with iTunes on your computer when your iPhone is plugged in to power and connected to Wi-Fi"

I haven't had to plug in either. I can't help but think a few journalists misread or misinterpreted something and that's why all the tech blogs keep saying you have to be plugged in to power.

ya.. who knows. oh well.
 
The key word is "Automatically". If you leave the settings at defaults, your phone will initiate an automatic WiFi sync when it's plugged in to power.

You may initiate a manual WiFi sync at any time, no external power required.
 
The key word is "Automatically". If you leave the settings at defaults, your phone will initiate an automatic WiFi sync when it's plugged in to power.

You may initiate a manual WiFi sync at any time, no external power required.

ah okay! thanks a lot. automatic sync is kind of useless for me as i leave my computer turned off at night.
 
Yea, works without a power source for me.
To try this out, I converted a movie to iPhone 4 retina display resolution, then let my iPod Touch 4 download the movie over the air from iTunes. After 10 to 15 min, it was there on my iPod! iStat shows that 1.29GB has been sent on network utility.
 
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