China Unicom is now denying a report from earlier in the week stating that it had agreed to purchase 5 million WCDMA iPhones for sale in mainland China. “The report is not true,” Unicom spokesman Yi Difei told the UKPA. “Talks between us and Apple have been going on for some time, but no agreement has been reached yet. There are all kinds of possibilities. There is no particular timetable for the talks.” USAA, a privately held…