This year, all the models of the iPhone may have Face ID feature:

Apple's new models will be launched in the US tech company Apple's September event. In all these models, the company can offer Face ID feature. This is said by Apple sources in a media report. Even before a report claimed that Apple would launch three new iPhones this year and they would be priced lower than the iPhone X last year.

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The only iPhone X has Face ID feature: 

Face ID feature is still only given the iPhone's premium model in the iPhone X. According to a report by Digitimes, Suppliers of Vertical Cavity Surface Imaging Laser (VCSEL) believe that Apple is planning to provide face IDs in new models of iPhones and two models of iPad Pro. This will increase the demand for VCSEL. VCSEL is an optical component. It has an important role in the functioning of face ID.

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Face ID does the job: The only difference is the VCSEL setup between Apple's Face ID and other face recognition software. Apple's face ID uses VCSEL to identify users' faces. VCSEL creates a small laser relay on the face of users and with its help creates a 3D image of their face. This image conforms to the identity of Apple users and allows someone else to access your phone.

Apple also wants to add face ID technology to the app that offers financial convenience, so that users can do transactions with the help of face recognition technology. That's why Apple is investing quite well to improve face ID technology.