Apple signs deal with LG Innotek for Face ID components
The front-facing TrueDepth Camera is expected to be on all three 2018 iPhone models
Apple is expected to include Face ID on all three of its 2018 iPhone modelsand on the 2018 variants of the Apple iPad Pro. According to a report out of Korea, to help Apple build these features into the next generation of its smartphone and high-end tablets, the company has signed a pact with LG Innotek to provide it with some of the components needed for Face ID. More specifically, we're talking about the 3D sensing modules that help map out a 3D image of a face.
All three 2018 handsets will come with the TrueDepth Camera in the front only. A rear mounted TrueDepth Camera most likely won't be seen until the 2019 iPhone units are unveiled.
source: BGR
Things that are NOT allowed: