AT&T Inc. on Monday unveiled business plans for Apple Inc.'s iPhone, the first time that the mobile carrier has courted corporate customers of the smart phone. But the lowest-cost data plan is still two-and-a-half times higher than a comparable consumer plan.

The news comes on the heels of reports -- still unconfirmed -- that IBM Corp. will soon add support for the iPhone to its Lotus Notes enterprise messaging system.

AT&T's new iPhone plans for businesses, which it spelled out on its Web site, come with a minimum two-year service agreement. Unlike its consumer iPhone plans, however, which combine voice and data into one fee, AT&T's business billing splits the two.