Hello. I am new to iPhone and a bit confused. It looks like sometimes 4G means 4th generation iPhone from Apple. Other times it means the 4th generation of cellular wireless standards. Am I right? From the specifications posted on Apple website (http://www.apple.com/iphone/specs.html) , I don't see anything about 4G network standards. Does that mean the new iPhone 4 cannot take advantage of it? Thanks.