Summarising again - UID is just a number

To summarise what we have read until now,
(1) The UID is just a number
(2) The UID will just inform the inquirer whether the person is alive or not
(3) Will be made compulsory over a period of 15-20 years

My 2 bits.
(a) If there is no face linked to a UID, can I not still open a bank account with a falsified document of Harry whose UID I know?
(b) Can I still not buy a SIM card using some false documents as I do now?
(c) How does the business establishment owner ensure that the UID is indeed that of the customer who has walked into his business premise and asked for some service or product?