There are some really cool features on the Apple iOS 12.1 but some also not so awesome features for example, it's easy to hack your phones and anyone can do it. According this article on Forbes.com, security researcher Jose Rodriguez (in the video below) anyone can call your iPhone from another iPhone and once the call is turned into a FaceTime call, there is something they can do that will bring up the device's full contact list. There are also reports of graphics glitches, WiFi problems and battery life complaints. They are already beta testing 12.1.1 to fix these issues but unless you REALLLLLLY want that woozy face (drunk face) emoji maybe best to wait to upgrade