When BYOD works for me
On the subject of BYOD(ish) for my remote needs I can use Citrix Receiver or VMware View to connect into a Windows desktop env from my Mac or iPad. Both are very useful for weekend/out-of-hours support that being a sys admin usually incurs. Because I'm an owner of fruity tech I also have become the unofficial Apple support bod when it comes to linking BYOD kit to the office.
I also have a 2005/6 vintage work HP laptop which is still running XP (recently rebuilt) and that can use VPN to get in. But it runs like a dog nowadays, so I prefer to use my own kit.
There's no choice for BYOD when it comes to phone, so I still have a work Blackberry and my own iPhone.