AT&T Inc. and Apple Inc. on Tuesday said wireless service for the iPhone will range from $59.99 per month to $99.99 per month.

The highly anticipated gadget retails for $499 for a model with 4 gigabytes of storage and $599 for one with 8 gigabytes. It’s slated to go on sale at 6 p.m. local time Friday at Apple and AT&T retail stores as well as Apple’s Web site.

The $59.99 monthly plan includes 450 minutes of voice time; a $79.99 plan includes 900 minutes; and a $99.99 plan includes 1,350 minutes. All three offer 200 text messages, unlimited data services, minutes that roll over month-to-month and mobile-to-mobile calls. There also is a $36 activation fee.

Apple claims the iPhone - which combines the functions of a cell phone, iPod media player and Web-surfing device - will be easier to use than other smart phones because of its unique touch-screen display and intuitive software that allows for easy access to voice mail messages, the Internet, and video and music libraries.