Bring your own device (BYOD) - the mobile device is owned by the employee. The mobile will have to meet whatever profile is required by the company (in terms of OS version and functionality) and the employee will have to agree on the installation of corporate apps and to some level of oversight and auditing. This model is usually the most popular with employees but poses the most difficulties for security and network managers. Corporate owned, business only (COBO) - the device is the property of the company and may only be used for company business. Corporate owned, personally-enabled (COPE) - the device is chosen and supplied by the company and remains its property. The employee may use it to access personal email and social media accounts and for personal web browsing (subject to whatever acceptable use policies are in force). Choose your own device (CYOD) - much the same as COPE but the employee is given a choice of device from a list.