Yes, Vivo Y93 does have the HDR support in both cameras - front and rear.
Yes, Vivo Y93 is a dual 4G mobile phone. It is dual VoLTE also.
Yes, Vivo Y93 does have the face unlock support.
No. Vivo Y93 has a dedicated MicroSD card slot. You can use 2 sim cards and a memory card at the same time.