He estimated a large number of SAP's 13,000 existing iPhone users will want to move to the iPhone 5, but workers have the option of testing out Android devices such as the Galaxy S III, too. SAP creates about 100 different mobile apps for enterprises, many of them used internally.

Terex, a global manufacturing company with 1,000 smartphone users, already supports the iPhone and Android phones under a BYOD framework. "The iPhone 5 won't change our thinking," said Terex CIO Greg Fell, in an interview. "We'll keep buying them like before. People will be happy with the LTE support."

Terex, like SAP, has negotiated data rates with carriers, making concerns about a data usage explosion from the iPhone 5 less of a worry, Fell said.

Alex Yohn, assistant direct of technology for West Virginia University, said some of the college's 30,000 students in Morgantown, W.Va., have talked about wanting to buy an iPhone 5. But he said that the area is not served yet by LTE, making that a less important feature. About 40% of the 450 staff members in IT jobs use smartphones, he said.

Yohn said iOS 6 and iPhone 5 don't provide enough software and hardware changes over earlier models to cause support concerns for his staff. Many users on campus rely on Wi-Fi, which could take the brunt of more data traffic from the iPhone 5 or other new smartphones. Even so, Yohn said the university is prepared.