We've had multi-user accounts on our Android tablets for some time now, but it required a bit of hackery to make it work with your Android phone. Too much hackery for something that should be standard on any phone in our opinion. The good news is that with Lollipop, this has been addressed and proper multiple user accounts and guest accounts are supported in "stock" Android.

If you've used these features on a tablet, the process and setup is mostly the same. If you've not seen it, here's a quick overview of how it works and what you can do with it.