Cingular Wireless, the mobile unit of AT&T, has received about 1 million inquiries about Apple upcoming iPhone, AT&T Chief Operating Officer Randall Stephenson said on Tuesday.

“One million people have asked us to call when this phone is available,” Stephenson said in his keynote speech at the CTIA wireless technology conference.

While Cingular is not taking advance orders for the iPhone, it is inviting visitors to their site to leave their e-mail addresses to receive information about the phone when it is released.

iPhones play music and video and have a unique touch screen interface. The version with 4 gigabytes of flash memory will cost $499, while the 8-gigabyte version will cost $599.