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.
07-16-2010 12:11 AM