BYOD not only requires multi-platform support but multi-department support, too. "BYOD requires significant cross-departmental overhead to ensure that everyone involved in employee administration, from HR to IT to security, is on the same page," says Rainer Enders, CTO Americas for NCP engineering, a VPN solutions provider.

When a BYOD employee gives notice or is terminated, HR and IT must work quickly to de-provision the personal device off the corporate network, Enders says. This process is much easier if the company owns the device. Another cross-departmental concern arising from BYOD is when a part-time employee or contractor wants to connect their device to the network.

It's likely a company will have to invest in, say, a liaison or some other multi-department communication process to handle BYOD issues.

All tallied, BYOD doesn't look pretty from a cost perspective. A typical mobile BYOD environment costs 33 percent more than a well-managed wireless deployment where the company owns the devices, according to Aberdeen.