AT&T does not appear to be planning any major changes to its data plan prices for the iPhone 3G S and iPhone 3G, says the Wall Street Journal. "We've been very happy with our pricing," said AT&T spokesman Mark Segal, who went on to mention the average monthly bill for an iPhone user was within $90 to $100. The Wall Street Journal suggests AT&T could charge an additional $10 to $40 for MMS and tet
