Is auto-authorization by phone number possible?

Question

User identification

Hello
, the question is gnawing at me, but before I google a mobile dev unfamiliar to me, I think it’s more effective to ask practitioners.

Let's say there is an application that has a user base. Let's say this is a siremka of the horns and hooves company, and the admin has entered all the employees. Including a phone number.
Can an app automatically authorize a user who has opened it on their phone? Give him personalized functions for his role, say hello by name and patronymic after the first launch.
Have you seen examples of such applications where you are logged in after launching an application on a device with a phone number?
Is it possible to fake it so that the application does not feed your number, and how difficult is it not in laboratory conditions?

Answer 1

IMHO in CRM it is necessary to authorize not the device, but the user personally. Get some biometrics.