The larger screen, up from 3.5-in. in previous iPhones, will be more useful to workers for running corporate apps, he said.

Because the device will be attractive and fast, more data than ever will be used, Fulton said. "Technology leaders should be concerned with the iPhone's data plans and users blowing past them," he said. "There's a dramatic cost risk."

Some carriers are advertising LTE download speeds in excess of 10 Mbps, but speeds could be much higher as networks improve in coming years.

Fulton said organizations that have implemented a BYOD strategy already will find the iPhone 5 "not much worse" than integrating other smarpthones. Also, iOS 6 is not much more challenging to manage than iOS 5, he said.

iOS 6 is due to roll out next Wednesday, Sept. 19.