These days everyone seems to have a smart phone, be it an iPhone or Android. Lots of people have tablets too. We almost expect every place we go to have free WiFi for us to jump on. Users also seem to expect to bring their personal devices to work and connect to the corporate WiFi. At my previous $dayjob we started implementing wireless and management didn't want to deploy a free/open WiFi network for guests, only the corporate one. What we found was users connecting to the corporate wireless network with their personal devices. We never made any announcement that wireless was available for corporate use, the users just found it and logged on.
BYOD (Bring Your Own Device) has been, and still is, very popular these days. Fewer corporations issue cell phones and let employees use their personal phones instead. With these changes in policies, the IT department has to support devices they may not be familiar with or have control over. The Helpdesk can help a user get their phone or tablet connected to the corporate email or wireless networks, as well as some troubleshooting when there are issues. At some point, since the end device is not owned by the company, the Helpdesk has to tell the user they have done all they can and the user needs to go to the manufacturer or carrier for additional help. Is there a black and white line as to when you have to cut off the help for one of these personal devices? Do you go to the point of resetting the user's device back to factory defaults to try to resolve the issue?
The other concern with BYOD is security. I know a number of security professionals, that if it was their choice, they would not allow Android devices on the network. This is due to the diverse implementation of the OS on the variety of manufacturer's devices, lower quality security implementation, and higher number of rooted phones. What personal devices does your company allow on the network? iOS? Android? Windows phone? Surface? What do you say when a user calls the Helpdesk to connect an unsupported device?
Once you connect a personal device into a corporate network it now has access to potentially sensitive information, email to be the biggest. There are MDM solutions that try to protect the corporate data, but mobile devices are not designed to separate personal and business information, so these policies on a mobile device apply to the entire device. Do users allow the MDM app to be installed on their personal device? Do users have issues with privacy and connecting their personal devices to your corporate network? Do users think that the company is reading their personal email on their phone?