According the officially press release of China Unicom(rank #3 in China market), iPhone will launch in China at 2009Q4. Rumors say the date should be Oct. 1st.
Not only people in China mainland cannot access sensitive information of the outside world, the people from outside world also cannot access pages inside with sensitive words. Every such access will receive a TCP reset. Just found out this morning.
As of July 18, 2009: facebook.com twitter.com *.blogspot.com bloglines.com *.wordpress.com www.greatfirewallofchina.org picasaweb.google.com news.wenxuecity.com www.youtube.com my.opera.com http://en.wikipedia.org/wiki/List_of_websites_blocked_in_the_People%27s_Republic_of_China Updated July 29, 2009: www.metacafe.com