AT&T has responded to the formal announcement of the CDMA-compliant iPhone 4 for Verizon Wireless, which has also issued a response to AT&T’s statement. Speaking with the Washington Post, AT&T spokesman Mark Siegel downplayed the announcement, saying, “For iPhone users who want the fastest speeds, the ability to talk and use apps at the same time and unsurpassed global coverage, the only choice is AT&T.” Verizon responded to AT&T’s statement with a scathing response of its own. “The AT&T network can’t handle AT&T calls,” said Verizon Wireless spokesman Jeffrey Nelson. “AT&T iPhone customers should come on over. We have built a network that will ensure their calls go through. What a nice change for iPhone lovers.” The back-and-forth statements are only the beginning of what is likely to be a hard-fought battle between the two carriers over U.S. iPhone customers.